Add formatting scripts for GitHub Actions

These are from the main repo, but simplified. Also add FUNDING.yml

.github/FUNDING.yml

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+patreon: godotengine
+custom: https://godotengine.org/donate

.github/workflows/scripts/black_format.sh

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+#!/usr/bin/env bash
+
+# This script runs black on all Python files in the repo.
+
+set -uo pipefail
+
+# Apply black.
+echo -e "Formatting Python files..."
+PY_FILES=$(find \( -path "./.git" \
+                \) -prune \
+                -o \( -name "SConstruct" \
+                -o -name "SCsub" \
+                -o -name "*.py" \
+                \) -print)
+black -l 120 $PY_FILES
+
+git diff > patch.patch
+
+# If no patch has been generated all is OK, clean up, and exit.
+if [ ! -s patch.patch ] ; then
+    printf "Files in this commit comply with the black style rules.\n"
+    rm -f patch.patch
+    exit 0
+fi
+
+# A patch has been created, notify the user, clean up, and exit.
+printf "\n*** The following differences were found between the code "
+printf "and the formatting rules:\n\n"
+cat patch.patch
+printf "\n*** Aborting, please fix your commit(s) with 'git commit --amend' or 'git rebase -i <hash>'\n"
+rm -f patch.patch
+exit 1

.github/workflows/scripts/clang_format.sh

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+#!/usr/bin/env bash
+
+# This script runs clang-format on all relevant files in the repo.
+# This is the primary script responsible for fixing style violations.
+
+set -uo pipefail
+IFS=$'\n\t'
+
+CLANG_FORMAT_FILE_EXTS=(".c" ".h" ".cpp" ".hpp" ".cc" ".hh" ".cxx" ".m" ".mm" ".inc" ".java" ".glsl")
+
+# Loops through all text files tracked by Git.
+git grep -zIl '' |
+while IFS= read -rd '' f; do
+    for extension in ${CLANG_FORMAT_FILE_EXTS[@]}; do
+        if [[ "$f" == *"$extension" ]]; then
+            # Run clang-format.
+            clang-format -i "$f"
+        fi
+    done
+done
+
+git diff > patch.patch
+
+# If no patch has been generated all is OK, clean up, and exit.
+if [ ! -s patch.patch ] ; then
+    printf "Files in this commit comply with the clang-format style rules.\n"
+    rm -f patch.patch
+    exit 0
+fi
+
+# A patch has been created, notify the user, clean up, and exit.
+printf "\n*** The following differences were found between the code "
+printf "and the formatting rules:\n\n"
+cat patch.patch
+printf "\n*** Aborting, please fix your commit(s) with 'git commit --amend' or 'git rebase -i <hash>'\n"
+rm -f patch.patch
+exit 1

.github/workflows/scripts/file_format.sh

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+#!/usr/bin/env bash
+
+# This script ensures proper POSIX text file formatting and a few other things.
+# This is supplementary to clang_format.sh and black_format.sh, but should be
+# run before them.
+
+# We need dos2unix and recode.
+if [ ! -x "$(command -v dos2unix)" -o ! -x "$(command -v recode)" ]; then
+    printf "Install 'dos2unix' and 'recode' to use this script.\n"
+fi
+
+set -uo pipefail
+IFS=$'\n\t'
+
+# Loops through all text files tracked by Git.
+git grep -zIl '' |
+while IFS= read -rd '' f; do
+    # Ensure that files are UTF-8 formatted.
+    recode UTF-8 "$f" 2> /dev/null
+    # Ensure that files have LF line endings and do not contain a BOM.
+    dos2unix "$f" 2> /dev/null
+    # Remove trailing space characters and ensures that files end
+    # with newline characters. -l option handles newlines conveniently.
+    perl -i -ple 's/\s*$//g' "$f"
+    # Remove the character sequence "== true" if it has a leading space.
+    perl -i -pe 's/\x20== true//g' "$f"
+
+    # We don't want to change lines around braces in godot/tscn files.
+    if [[ "$f" == *"godot" ]]; then
+        continue
+    elif [[ "$f" == *"tscn" ]]; then
+        continue
+    fi
+    if [[ $(uname) == "Linux" ]] && [[ "$f" != *"xml" ]]; then
+        # Remove empty lines after the opening brace of indented blocks.
+        sed -z -i 's/\x7B\x0A\x0A\x09/\x7B\x0A\x09/g' "$f"
+        # Remove empty lines before the closing brace (in some cases).
+        sed -z -i 's/\x0A\x0A\x7D/\x0A\x7D/g' "$f"
+    fi
+done
+
+git diff > patch.patch
+
+# If no patch has been generated all is OK, clean up, and exit.
+if [ ! -s patch.patch ] ; then
+    printf "Files in this commit comply with the formatting rules.\n"
+    rm -f patch.patch
+    exit 0
+fi
+
+# A patch has been created, notify the user, clean up, and exit.
+printf "\n*** The following differences were found between the code "
+printf "and the formatting rules:\n\n"
+cat patch.patch
+printf "\n*** Aborting, please fix your commit(s) with 'git commit --amend' or 'git rebase -i <hash>'\n"
+rm -f patch.patch
+exit 1

.github/workflows/static_checks.yml

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+name: Static Checks
+on: [push, pull_request]
+
+jobs:
+  static-checks:
+    name: Formatting (clang-format, black format, file format)
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get update -qq
+          sudo apt-get install -qq dos2unix recode clang-format
+          sudo pip3 install git+https://github.com/psf/black@master
+
+      - name: File formatting checks (file_format.sh)
+        run: |
+          bash ./.github/workflows/scripts/file_format.sh
+
+      - name: C/C++ style checks via clang-format (clang_format.sh)
+        run: |
+          bash ./.github/workflows/scripts/clang_format.sh
+
+      - name: Python style checks via black (black_format.sh)
+        run: |
+          bash ./.github/workflows/scripts/black_format.sh