COPYRIGHT: Update with recent additions, cleanup

Also include public domain assets in `COPYRIGHT.txt` with Unlicence text or
dual-licensing scheme.

And document commit hashes for most thirdparty code in `thirdparty/README.md`
for clarity, and in case there's no tag matching the included version numbers.

(cherry picked from commit c6802a65c6)

COPYRIGHT.txt

@@ -56,18 +56,18 @@ Copyright: 2017, Andrea Calabró
 License: CC-BY-4.0
 
 Files: ./modules/fbx/fbx_parser/
-Comment: Open Asset Import Library (assimp)
-Copyright: 2006-2016, assimp team
+Comment: Open Asset Import Library (FBX parser)
+Copyright: 2006-2020, assimp team
  2007-2021, Juan Linietsky, Ariel Manzur.
  2014-2021, Godot Engine contributors.
-License: BSD-3-clause and Expat
+License: BSD-3-clause
 
-Files: ./platform/android/java/aidl/com/android/vending/billing/IInAppBillingService.aidl
- ./platform/android/java/res/layout/status_bar_ongoing_event_progress_bar.xml
- ./platform/android/java/src/com/google/android/vending/expansion/downloader/*
- ./platform/android/java/src/com/google/android/vending/licensing/*
- ./platform/android/java/src/org/godotengine/godot/input/InputManagerCompat.java
- ./platform/android/java/src/org/godotengine/godot/input/InputManagerV16.java
+Files: ./platform/android/java/lib/aidl/com/android/vending/licensing/
+ ./platform/android/java/lib/res/layout/status_bar_ongoing_event_progress_bar.xml
+ ./platform/android/java/lib/src/com/google/android/vending/expansion/downloader/
+ ./platform/android/java/lib/src/com/google/android/vending/licensing/
+ ./platform/android/java/lib/src/org/godotengine/godot/input/InputManagerCompat.java
+ ./platform/android/java/lib/src/org/godotengine/godot/input/InputManagerV16.java
 Comment: The Android Open Source Project
 Copyright: 2008-2013, The Android Open Source Project
 License: Apache-2.0
@@ -88,11 +88,6 @@ Copyright: 1997-2017, Sam Lantinga
  2014-2021, Godot Engine contributors.
 License: Expat and Zlib
 
-Files: ./scene/animation/tween_interpolaters.cpp
-Comment: Penner Easing
-Copyright: 2001, Robert Penner
-License: BSD-3-clause
-
 Files: ./servers/physics/gjk_epa.cpp
  ./servers/physics/joints/generic_6dof_joint_sw.cpp
  ./servers/physics/joints/generic_6dof_joint_sw.h
@@ -166,13 +161,14 @@ License: FTL
 
 Files: ./thirdparty/glad/
 Comment: glad
-Copyright: 2013-2019, David Herberth
+Copyright: 2013-2020, David Herberth
+ 2007-2020 The Khronos Group Inc.
 License: Expat
 
-Files: ./thirdparty/jpeg_compressor/
+Files: ./thirdparty/jpeg-compressor/
 Comment: jpeg-compressor
 Copyright: 2012, Rich Geldreich
-License: public-domain
+License: public-domain or Apache-2.0
 
 Files: ./thirdparty/libogg/
 Comment: OggVorbis
@@ -226,12 +222,17 @@ License: BSD-3-clause
 
 Files: ./thirdparty/mbedtls/
 Comment: Mbed TLS
-Copyright: 2006-2018, Arm Limited (or its affiliates)
+Copyright: The Mbed TLS Contributors
 License: Apache-2.0
 
+Files: ./thirdparty/minimp3/
+Comment: MiniMP3
+Copyright: lieff
+License: CC0-1.0
+
 Files: ./thirdparty/miniupnpc/
 Comment: MiniUPnPc
-Copyright: 2005-2018, Thomas Bernard
+Copyright: 2005-2019, Thomas Bernard
 License: BSD-3-clause
 
 Files: ./thirdparty/minizip/
@@ -276,6 +277,12 @@ Comment: Tangent Space Normal Maps implementation
 Copyright: 2011, Morten S. Mikkelsen
 License: Zlib
 
+Files: ./thirdparty/misc/open-simplex-noise.c
+ ./thirdparty/misc/open-simplex-noise.h
+Comment: OpenSimplex Noise
+Copyright: 2014, Stephen M. Cameron
+License: public-domain or Unlicense
+
 Files: ./thirdparty/misc/pcg.cpp
  ./thirdparty/misc/pcg.h
 Comment: Minimal PCG32 implementation
@@ -288,6 +295,11 @@ Comment: SMAZ
 Copyright: 2006-2009, Salvatore Sanfilippo
 License: BSD-3-clause
 
+Files: ./thirdparty/misc/stb_vorbis.c
+Comment: stb libraries
+Copyright: Sean Barrett
+License: public-domain or Unlicense or Expat
+
 Files: ./thirdparty/misc/triangulator.cpp
  ./thirdparty/misc/triangulator.h
 Comment: PolyPartition
@@ -347,7 +359,7 @@ License: BSD-3-clause
 
 Files: ./thirdparty/wslay/
 Comment: Wslay
-Copyright: 2011-2015, Tatsuhiro Tsujikawa
+Copyright: 2011, 2012, 2015, Tatsuhiro Tsujikawa
 License: Expat
 
 Files: ./thirdparty/xatlas/
@@ -499,6 +511,121 @@ License: BSL-1.0
  ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  DEALINGS IN THE SOFTWARE.
 
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+ Copyright and Related Rights in the Work or (ii) assert any associated claims
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+ 4. Limitations and Disclaimers.
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 License: CC-BY-4.0
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  .
@@ -1452,6 +1579,32 @@ License: OFL-1.1
  DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE.
 
+License: Unlicense
+ This is free and unencumbered software released into the public domain.
+ .
+ Anyone is free to copy, modify, publish, use, compile, sell, or
+ distribute this software, either in source code form or as a compiled
+ binary, for any purpose, commercial or non-commercial, and by any
+ means.
+ .
+ In jurisdictions that recognize copyright laws, the author or authors
+ of this software dedicate any and all copyright interest in the
+ software to the public domain. We make this dedication for the benefit
+ of the public at large and to the detriment of our heirs and
+ successors. We intend this dedication to be an overt act of
+ relinquishment in perpetuity of all present and future rights to this
+ software under copyright law.
+ .
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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+ ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ OTHER DEALINGS IN THE SOFTWARE.
+ .
+ For more information, please refer to <https://unlicense.org/>
+
 License: Zlib
  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages