Added warning-popups in case when app is unable to play attachment in slideshow or when call has been started, minor GUI improvements
[ABS] Ready.
- Original Tag: submit/tizen/20160616.065736 (98dde545d696ae9e963bd67b741bf97408c2c60c)
- Original Commit: ab6acf18f17989893b0186e6e4c48fa1d1a394b6
- Requested By: and.klimenko@samsung.com