Adding support for iPhone 6 Plus icons

- For App icon, 180x180: Added new `-60@3x.png`
- For Spotlight search results icon, 120x120: Verified it uses existing `-60@2x.png`
- For Settings icon, 87x87: Added new `-Small@3x.png`
[TIMOB-17663] Rename images
[TIMOB-17663] Remove UILaunchImages from template and autogenerate in cli
[TIMOB-17633] Support Landscape launch image for iPhone6 Plus
[TIMOB-17663] Code Refactor
[TIMOB-17684] fix splashscreen image on background
Merge pull request #6043 from FokkeZB/patch-1

Adding support for iPhone 6 Plus icons
Merge pull request #6097 from vishalduggal/timob-17663

[TIMOB-17663][TIMOB-17684] iOS8 fixes