Fix bug #8507 (Themes code throws errors during wholesale file updates) -
Don't assume FS "change" event's 'entry' arg is non-null
Removed font definitions from css since they are handled in the fonts api
Change references to "custom scrollbars" to "theme scrollbars"
Move scrollbar customizations into core UI theme
Fix the selector for dark scrollbars on win and linux
Merge pull request #8516 from adobe/dangoor/8384-theme-scrollbars

Change theme scrollbar naming and set default dark scrollbars
Fix for #8488 by making the selector for the cursor as specific as the one in codemirror.
Merge pull request #8510 from adobe/pflynn/themes-fschange-fix

Fix bug #8507 (Themes code throws errors during wholesale file updates)
Merge pull request #8512 from MiguelCastillo/fonts-cssclean

Removed font definitions from css since they are handled in the fonts ap...