* remove unused scoring system code
* add test for Alms Collector replacement effect
* flatten draw cards into single method in PlayerImpl
* remove outdated MageAction framework
* clarify game event for drawing two or more cards
* clarify methods for getting cards from library
* implement [WHO] River Song
* fix error
* adjust library methods
* add lots of test cases for draw replacement effects
* fix#12616
* track cards drawn this way through multi draw replacement as well
* add test for River Song
* remove redundant comment
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.
