removed unused code.
Cleanup and remove GoCore.getPreferenceStore().
Cleanup: moved UI preferences to UI plugin.
removed unused code
Cleanup final usage of UI code in core plugin.
fix bug with previous commits
Fixed v0.8.0 bug where comments and strings were not highlighted.
Cleanup/refactoring of partitions color/scanner setup.
Fixed GoEditor setup of SourceViewConfiguration and pref store init.