fixes a few bugs along the way:
[[Pilgrim and Justice]] & [[Pilgrim of Virue]] were incorrectly adding a "to you" to their damage clause.
[[Ajani's Aid]] was improperly a one-use prevention effect.
[[Story Circle]] and [[Prismatic Circle]] have not been refactor as it is not currently possible to have a proper filter for them. Would require a FilterSource with a 4-argument match most likely.
* refactor: improved target pointer init code and logic, added docs and runtime checks;
* game: fixed miss or wrong init calls in some continuous effects;
* game: fixed wrong usage of target pointers (miss copy code, miss npe checks);
* 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
