First steps modernizing SaveToGallery ViewController

- present it using a modal segue, over full screen
- no more hacky fussing with content view sizing since I'm doing it the way I'm supposed to now
- works same as before otherwise
Get rid of unused old SaveToGalleryViewController from main.storyboard
Implemented a custom higher quality transition for SaveToGalleryViewController

NOTE:
Using a proper transitionDelegate via SaveToGalleryTransitionManager FAILED. Not certain if my fault or iOS but I see a some reports on StackOverflow about a similar crash. I'm leaving the class in, because I may use it in the future. But it's not being used. Instead I implemented a faux transition by setting the modal overlay transition to crossfade and then in viewWillAppear I animate a springy plopping in of the dialog.

ALSO:
Fixed animation of dialog vertical offset when keyboard shows and hides by using an affine transform instead of animating the vertical centering constraint. Smoother!
Cleanups to animation
Fix where player name text field delegate wasn't set ( whoops )
Turn off auto show of save to gallery VC for testing