UI Module classes will not delete children if ownsChildren is set to true, added setOwnsChildrenRecursive method to Entity, cleanup when closing screen editor, font editor and image editors in the IDE, fixed some memory leaks
Removed addDropShadow from ScreenLabel
Merge branch 'master' of https://github.com/ivansafrin/Polycode
set root SDK to current Mac OS X
Fixed UIMenus broken by last commit
Added YES and NO events to UIEvent, added Yes/No/Cancel popup to IDE, IDE will now ask if you want to save file before closing if there are unsaved changes
Merge branch 'master' of https://github.com/ivansafrin/Polycode

# By Ivan Safrin
# Via Ivan Safrin
* 'master' of https://github.com/ivansafrin/Polycode:
  Added YES and NO events to UIEvent, added Yes/No/Cancel popup to IDE, IDE will now ask if you want to save file before closing if there are unsaved changes
  Fixed UIMenus broken by last commit