* 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);
* apply regex to change public copy constructors to protected
* cleanup code using now protected constructors
* fix manaBuilder weird casting of Mana into ConditionalMana
* Cumulative upkeep cost - fixed that it can lost payed state (cards: Aboroth, Karplusan Minotaur, Psychic Vortex, Sheltering Ancient);
* Effects - fixed that it can lost selected targets or other settings (cards: Citadel of Pain, Crimson Honor Guard, Curfew, Leveler, Mana Cache, Monsoon, Paradigm Shift, Saprazzan Bailiff);
* Exile all cards from graveyard ability - fixed that it can lost targets (example: Agent of Erebos);
* Melee ability - fixed that it can lost targets (example: Adriana, Captain of the Guard).