Review usage of GameEvent.BEGINNING_PHASE_PRE and replace most of them by BEGIN_TURN

from comment https://github.com/magefree/mage/commit/0dceeb78bdae2cff9362d152a568ef2954877a6d#r161989958

The `BEGIN_TURN` just got added, and is guarantee to only trigger once per turn.
Issue with `BEGINNING_PHASE_PRE` is that there could be no beginning phase, or multiple ones ([[Shadow of the Second Sun]] already exist), and the watcher and/or trigger logic relying on the event may not handle that well.