Fixes
* https://github.com/adobe/brackets/issues/7222
* https://github.com/adobe/brackets/issues/5288
* https://github.com/adobe/brackets/issues/6801

Added
cef_buffered_dc for easier impl of buffered drawing

Removed dup
https://github.com/adobe/brackets-shell/commit/f474f069e5240ca3fbb55c1db94561ea32695ba1#commitcomment-6319894
Merge branch 'jeff/fix_aero_issues' of https://github.com/adobe/brackets-shell into jeff/fix_aero_issues