videodb: add seasonview and refactor GetSeasonsNav()and refactor GetSeasonsNav()
videodb: add DeleteSeason()
[omxplayer] Remove unused framerate functions

Purely cosmetic, should have no functional change
Merge pull request #4704 from popcornmix/unused_framerate

[omxplayer] Remove unused framerate functions
Merge pull request #4724 from Montellese/videodb_seasonview

videodb: add seasonview and refactor GetSeasonsNav()
upnp: fix mapping of Neptune log levels to our log levels