BugFixes; Added SlingShotStage; RenderedScrollFact.cs; ScrollDetails.cs;

BugFixes:
+ repaired Play/Create button in InGameEditor
+ null exception when deleting assigned fact / parsing null-hint
+ <no label> for defined and filtered facts from application
+ collission Player <> snapzone

RenderedScrollFact.cs:
+ changed primary key from ID to ScrollFactURI

ScrollDetails.cs:
+ fully enabled ScrollOverwrites
+ filtering null-"df" assignments from Scrolls
+ reduced number of dynamic scroll applications