Revert "Player: Finer a/v sync adjustments"

This reverts commit f8d72280ccb3ec28391182cf6eaaf20c9c87ae4f.
Revert "Player: Enable AVSync to recover quicker after a seek or program change"

This commit broke audio or frame rate change detection following a seek or channel change

This reverts commit 195eb07fb106fbabf164a1989860adcc132ab9d2.
Revert "TV UnpauseLiveTV calls tvchain->SwitchTo opposed to JumpTo to minimise visible disruption"

This commit broke LiveTV channel change

This reverts commit bfc6b9ed58029955d5a4230cad5851ed4848ed20.