Updated .gitignore

- Makes a clear distinction between files and directories, don't ignore build files
- Added some file types and directories
- ignore also 'lite-xl' prefixed install directories other than the executable

.gitignore

@@ -1,13 +1,19 @@
-build*
+build*/
-.build*
+.build*/
-.run*
+lhelper/
-*.zip
+submodules/
-*.tar.gz
+subprojects/lua/
-.lite-debug.log
+subprojects/libagg/
-subprojects/lua
+subprojects/reproc/
-subprojects/libagg
-subprojects/reproc
-lite-xl
-error.txt
 .ccls-cache
+.lite-debug.log
+.run*
+*.diff
+*.tar.gz
+*.zip
+*.DS_Store
+*App*
+appimage*
 compile_commands.json
+error.txt
+lite-xl*