Merge pull request #3861 from uklotzde/gitignore

Update and clean up .gitignore

.gitignore

@@ -7,32 +7,32 @@
 *.log
 *.log.*
 
-# Compilation artifacts
-src/mixxx.rc.include
-src/mixxx.res
-src/test/**/*.actual
-res/qrc_mixxx.cc
+# TOOLS
 
+# Might be created when running a Python script from the tools folder
 __pycache__
 
-# TOOLS
-
 # Clang/cmake
 *_build
 compile_commands.json
 
 # Doxygen documentation
-/doxygen/
+/doxygen
 
 # Exclude buildenv directory from our helper scripts
-/buildenv/
+/buildenv
 
 # CMake build configurations, generated by tools/windows_buildenv.bat
-CMakeSettings.json
+/CMakeSettings.json
 
 # Build and distribution directories for various build configurations
-/build/
-/install/
+/build
+/install
 
-# VisualStudio project files
-/.vs/
+# Legacy compilation artifacts that are obsolete starting with 2.3
+# TODO: Delete after 2.2 with SCons has been abandoned. Developers
+# are supposed to clean their project directory!
+src/mixxx.rc.include
+src/mixxx.res
+src/test/**/*.actual
+res/qrc_mixxx.cc