Change phases to have different completion conditions

[cdsupina]

Currently, all phases in the game are completed when a set amount of 1-second ticks have been completed. This system makes sense for the enemy and rest phases but doesn't make much sense for a boss phase. A boss phase should only be completed when the boss is destroyed.

Let's change the PhaseManagerResource and Phase to allow for both phases with a tick limit and for phases with other completion conditions.