2.2.9
#703 #4093 callbacks should not occur when using is valid
Fixes missing message var
Fixes #4145 image icon causes issues in header
Removes all references to year from copyright notice (lets save some annoyance every january)
#4688 #4692 Fixes issue where backslash and other spcial characters may cause dropdown to fail
Adds unstackable variation to items #2901