Clean up .gitignore

.gitignore

@@ -5,53 +5,75 @@
 # created during manual debugging and many people like to clean up instead of
 # having git ignore such leftovers. You can use `.git/info/exclude` to
 # configure your local ignore list.
-# FIXME: This needs cleanup.
+
-*~
+## File system
+.DS_Store
+desktop.ini
+
+## Version control
+.hgignore
+.hg/
+
+## Editor
 *.swp
 *.swo
-.#*
+Session.vim
-.DS_Store
 .cproject
-.hg/
-.hgignore
 .idea
 *.iml
-__pycache__/
-*.py[cod]
-*$py.class
-.project
-.settings/
-.valgrindrc
 .vscode
+.project
 .favorites.json
-/Makefile
+.settings/
-/build/
+
+## Tool
+.valgrindrc
+.cargo
+# Included because it is part of the test case
+!/src/test/run-make/thumb-none-qemu/example/.cargo
+
+## Configuration
 /config.toml
-/dist/
+/Makefile
+config.mk
+config.stamp
+no_llvm_build
+
+## Build
 /dl/
 /doc/
 /inst/
 /llvm/
 /mingw-build/
-/src/tools/x/target
+/build/
-# Created by default with `src/ci/docker/run.sh`:
+/dist/
-/obj/
 /unicode-downloads
 /target
-# Generated by compiletest for incremental:
+/src/tools/x/target
+# Generated by compiletest for incremental
 /tmp/
+# Created by default with `src/ci/docker/run.sh`
+/obj/
+
+## Temporary files
+*~
+\#*
+\#*\#
+.#*
+
+## Tags
 tags
 tags.*
 TAGS
 TAGS.*
-\#*
+
-\#*\#
+## Python
-config.mk
+__pycache__/
-config.stamp
+*.py[cod]
-Session.vim
+*$py.class
-.cargo
+
-!/src/test/run-make/thumb-none-qemu/example/.cargo
+## Node
-no_llvm_build
 **node_modules
 **package-lock.json
+
 # Before adding new lines, see the comment at the top.