input behaviour
experimental grouping works, display selection on the right
multi drag support
regions added, renamed some variables, visual selectionarea buggy
visual grouping bug fixed
more efficient calculation of selection area in composite
added resize rectangle, currently without function, mouse hover not tracked yet
replaced selection with composite, no more direct access to shapes :)
resizing of single elements working
group resizing works
added comments for lukas, renamed some vars, cleared structure
Merge branch 'multi-selection'