* Add /.cache/ to .gitignore
Normally clangd's .cache exists in /build/, which is already in the .gitignore, but if cmake is run in the repository root instead of /build/ the cache is in turn generated in the repository root.
* Also add compile_commands.json to .gitignore
* Update third-party actions to latest version
* Use vcpkg in manifest mode
* Only trim ccache after build
* Use ccache with MSVC
* Use Brewfile and cache Homebrew downloads
* Use --print-config for ccache 3
* Attempt to make ccache actually work with MSVC
* Zero ccache stats before building
* Use SDL2 on macOS
No functional changes! No changes to savefiles/presets!
Fixes casing of everything that is currently lowercase but should
be uppercase.
Fixes also some other plugin strings, especially:
* opl2 -> OpulenZ (see 289887f4fc)
* calf -> veal (see ae291e0709)
* ladspa_effect -> LadspaEffect (see 9c9372f0c8)
* remove flp_import (see 2d1813fb64)
