* replaced blocking/blocked by predicates
* added test for knight of dusk (currently fails)
* added source parameter to filters and everything else that needs it
* some changes to various predicates
* test fix
* small changes to filter code
* merge fix
* fixed a test failure
* small change to Karn, Scion of Urza
* removed sourceId from filter methods and other similar places
* added new getobject method to fix some test failures
* a few more fixes
* fixed merge conflicts
* merge fix
* added new discard method
* started refactoring to use new discard method
* refactored A through I
* fixed some issues
* separated balance effect into its own class
* refactored J through R
* refactored S through Z
* applied requested changes
