EXT-7209 EXT-7366 EXT-7213 FIX EXT-7392 WIP

Final fixes for:
EXT-7209 camera to enter appearance edit mode
EXT-7366 change camera to face front of avatar in previews
EXT-7213 kill old appearance editor

Partial fix for:
EXT-7392 alpha mask checkboxes are not hooked up

All changes code reviewed by vir. Following commits (plus this one) reviewed with this checkin:
425d4e960450
15d04b6464a7
e92ae606de12
adc94512ea9b
24577dbbf7a4
6f28b241eae2

(sorry dessie! :) )