* launcher: add favorite apps
Favorite apps always appear above non-favorite apps
Accepts regex, same logic as #920
Added the same regex logic to hidden apps
Added util file may need to be relocated
* addressed requested changes
* fix: Renamed newly added util singleton
Also added a null check to favorite icon loader in AppItem.qml
* controlCenter/launcherPane: added favorite apps
added icons to the app list to indicate if they are favorited/hidden
marking as favorite/hidden is desabled if the other is selected
* favouriteApps: renamed from favorite to favourite
Also disabled favorite/hidden switch for entries added as regex
* appDb: added notify and emit to favoriteApps
* controlCentre/Launcher: Fixed bug with favourite switch not enabling itself when no hiddenApps exist
Added a comment to explain the enabled state of the switches
icon loader is now a single loader rather than two, hidden icon has
priority
* spelling mistakes
* fixed warning
* formatting fixes
