- 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
Currently the editor will not work if it is not installed.
There is also a caveat about the 'data' directory which is installed
in the bin directory. This may work but does not seem ok because it is
pollution a shared bin directory and the 'data' folder may not be unique
to Lite.