Add ability to play media in order

[WARGit]

each show in a schedule is played in chronological order and the order is tracked

[WARGit]

To achieve this i think planner.py would have to abstract shows by 1 level, such that when selecting a file to play it just selects a show, then depending on the schedule and the "PlayInOrder" property it would either pick the next show in line or a random one.

[WARGit]

This would also mean that durationAnalyzer.py wouldnt be the only analysis script needed, we would need one that identifies shows