Implementing clang-format and applying it to all classes

misc/hooks/README.md

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+# Git hooks for Godot Engine
+
+This folder contains git hooks meant to be installed locally by Godot Engine
+contributors to make sure they comply with our requirements.
+
+## List of hooks
+
+- Pre-commit hook for clang-format: Applies clang-format to the staged files
+  before accepting a commit; blocks the commit and generates a patch if the
+  style is not respected.
+  Should work on Linux and macOS. You may need to edit the file if your
+  clang-format binary is not in the $PATH, or if you want to enable colored
+  output with pygmentize.
+
+## Installation
+
+Copy all the files from this folder into your .git/hooks folder, and make sure
+the hooks and helper scripts are executable.