Media - Add player sorting

Use various criteria to maintain a sorting order of media
players. Leverage TreeMap to maintain order upon player add/update.

Bug: 161002989
Bug: 160242133
Merged-in: I07d0219523289fc8c5950d078bd0960bbdb1cc37
Test: manual, using various player types
Change-Id: I07d0219523289fc8c5950d078bd0960bbdb1cc37
(cherry picked from commit 642eae6b)