[DF-4829] Add application unload when system settings changed.
[DF-4777] Fix SetText in android text field
[DF-4851] flip density map Y in order to match density mask
[DF-4851] convert desnity bits to flipped format on load
[DF-4851] set all density mask bits to 1 in order to avoid problems with unconverted maps
DF-4871 Ability to set UIControlBackground RenderState explicitly
Merge branch 'to_master' of https://github.com/dava/dava.framework into to_master
Merge remote-tracking branch 'origin/to_master' into DF-4829_Crash_after_system_settings_chaged
Merge remote-tracking branch 'origin/DF-4829_Crash_after_system_settings_chaged' into to_master
Merge branch 'to_master' into development