glw: Make slideshow widget work in conditional ui rendering mode
rpi: When (re)initializing clock, clear seek_in_progress variable or we might crash

Fixes #2151
rtmp/hls/favideo: For live feeds, don't try to seek back to beginning on skip-to-previous event
4.6
revbump
Switch upgrade manifest URLs to https://showtimemediacenter.com/ ...
glw: Fix bug in value2size()
Update greek translation