Get basic C++ plugin working

.gitmodules

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+[submodule "godot-cpp"]
+	path = godot-cpp
+	url = https://github.com/IronicallySerious/godot-cpp

demo/.import/icon.png-487276ed1e3a0c39cad0279d744ee560.md5

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+source_md5="8dd9ff1eebf38898a54579d8c01b0a88"
+dest_md5="da70afec3c66d4e872db67f808e12edb"
+

demo/default_env.tres

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+[gd_resource type="Environment" load_steps=2 format=2]
+
+[sub_resource type="ProceduralSky" id=1]
+
+[resource]
+background_mode = 2
+background_sky = SubResource( 1 )

demo/demo.tscn

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+[gd_scene load_steps=3 format=2]
+
+[ext_resource path="res://bin/gitapi.gdns" type="Script" id=1]
+[ext_resource path="res://icon.png" type="Texture" id=2]
+
+[node name="Node2D" type="Node2D"]
+
+[node name="Sprite" type="Sprite" parent="."]
+texture = ExtResource( 2 )
+centered = false
+script = ExtResource( 1 )

demo/icon.png.import

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+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/icon.png-487276ed1e3a0c39cad0279d744ee560.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://icon.png"
+dest_files=[ "res://.import/icon.png-487276ed1e3a0c39cad0279d744ee560.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0

demo/project.godot

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+; Engine configuration file.
+; It's best edited using the editor UI and not directly,
+; since the parameters that go here are not all obvious.
+;
+; Format:
+;   [section] ; section goes between []
+;   param=value ; assign values to parameters
+
+config_version=4
+
+_global_script_classes=[  ]
+_global_script_class_icons={
+
+}
+
+[application]
+
+config/name="demo"
+run/main_scene="res://demo.tscn"
+config/icon="res://icon.png"
+
+[rendering]
+
+environment/default_environment="res://default_env.tres"