Alternative method to list shortcuts via includes
Additional properties separated by group, ability to browse for background image
Improvements to data loading and xml building

Data - If no group set, widgets backgrounds and custom properties
default to mainmenu
XML - Single running instance only, background progress dialog if menu
previously built
Rewrite of widgets/background/property loading and saving code in management dialog
Fix log spam
Regression fix: Backgrounds now save correctly from management dialog
Merge pull request #5 from unfledged/Development

New method of listing shortcuts, minor improvements