[REL] PlexCast Release

Spin-off of PlexPod (Forked code from @snoshoesledska GitHub)
Added DumbTools (@coryo GitHub) to allow adding podcasts from clients that don't support InputDirectoryObject
Update icons to new styling
Changed 'Add' action to 'Find' action (as that's what it does first)
Moved the 'Delete' action in to the Podcast feed listings (cleans the top menu)
Plus other updates... more to come