If you haven't already, install Package Control, then select
Package Control: Install Package dropdown list in the Command Palette.
You may also need to change the ColorScheme. Pick one from
Edit the yaml files with the
YAML-XXX extensions, convert them to plist xml files, and send in a pull request. The easiest way to do this is by using AAAPackageDev. You can do all of the above without leaving sublime text.
YAML is used since it's a lot more compact and easier to edit than xml.