xenodron mentionned that one of the use of setSourceId is to more easily find the Event that use non-standard
sourceId.
So reverting the change made in a previous commit.
It was a non-functional change meant to ease new
BatchEvent sharing sourceId, but I'll use setSourceId
instead there.
* initial refactor of damage events
* cleaned up some instances of classes that need to be removed
* removed old damage event classes
* removed outdated imports
* temporarily refactor Everlasting Torment (this will need to be changed more)
* updated damage handling to use new changes
* some reworking of lethal/excess damage plus a test
* updated damage marking to handle planeswalkers
* updated implementation of Phyrexian Unlife
* updated implementation of Everlasting Torment
* added some more excess damage tests
* small change to wither check
