[gui] adds listitem info label inprogress to determine if epg item is in progress

This adds a new listitem info label inprogress which indicates if the
associated epg tag points to a current ongoing program.
Added Container.IsUpdating
Merge pull request #4531 from Black09/container-isupdating

Added Container.IsUpdating
Merge pull request #4033 from xhaggi/pvr-listitem-isactive

[gui] adds listitem info label inprogress to determine if epg item is in progress
[buildsystem] new app icons for all platforms
[osx] create icon from the iconset
[atv2] use AppIcon.png from new path
updated icons