Somewhat implement pageDomain
Removes loader._control.appendChild for image
Keeps stage and root populated during removedFromStage
Merge pull request #702 from yurydelendik/yt-pageDomain

Misc yt player fixes
Merge pull request #704 from tobeytailor/buttons

Misc button(Mode) fixes and optimizations
Check if filesession callback exists
Fixes #8457ccc70a regression
Merge pull request #705 from yurydelendik/yt-fileerr

Misc yt player fixes
Fall through non-interactive objects in mouse target lookup.