Add support for generating clangd compile_commands.json config (#38)

* Implement support for generating clangd `compile_commands.json` config

* Add example .clangd file

* Tidy .gitignore and add entries for clangd and other things

* couple things i forgot to remove

* Change indent level to 2

* Centralize file type checking logic

* Refactor flag replacments to fix `-lang=` flags not being handled

* Move language flag fallback addition to `generate_build_ninja`

* Remove file type flags from .clangd example

* Remove clangd compiler defines option
Projects which need it can define things themselves in .clangd

* Move global clangd flags to tools/project.py & update vscode config

---------

Co-authored-by: Luke Street <luke@street.dev>

.gitignore

@@ -1,13 +1,35 @@
+# IDE folders
+.idea/
+.vs/
+
+# Caches
 __pycache__
-.idea
-.vscode
-.ninja_*
 .mypy_cache
-*.exe
-build
-build.ninja
-objdiff.json
+.cache/
+
+# Original files
 orig/*/*
 !orig/*/.gitkeep
+*.dol
+*.rel
+*.elf
+*.o
+*.map
+*.MAP
+
+# Build files
+build/
+.ninja_*
+build.ninja
+
+# decompctx output
+ctx.*
+*.ctx
+
+# Generated configs
+objdiff.json
+compile_commands.json
+
+# Miscellaneous
 /*.txt
-ctx.c
+*.exe