* Now AI can see and use special mana payments like convoke, delve, improvise pays;
* Now devs can test special mana payments (disable auto-payment and use choices for mana pool and special pays);
* Fixed broken TargetDiscard in tests;
* Fixed broken same named targets in tests;
* fixed wrong manually pay by mana pool (it pays generic cost instead colored part of monohybrid);
* fixed not working cost reduction effects (now monohybrid cost will be reduced correctly with some limitation, see #6130);
* Added support of spell ability choice in free cast (chooseSpellAbilityForCast);
* Added support of "up to" targets setup in addTargetAmount (use TestPlayer.TARGET_SKIP to stop target choose);
* Restored multiple checks for addTargetAmount;
* Fixed many wrong tests (wrong order or missing commands);
* Gain control abilities - fixed wrong target chooses by AI (selects weakest permanent instead most powerful);
* Target of an opponent’s choice abilities - fixed that AI was able to cancel card cast, fixed wrong target chooses (Evangelize, Echo Chamber, Arena, Preacher, etc);
(First time contributing so please excuse my noobness) Card not prevented by an effect should be playable ("&& !prevented"), but currently AI says card not prevented is NOT playable ("&& prevented"). Also, not sure why AI doesn't add to unplayable even though its not contained by playableInstants or playableNonInstants. I'm not even sure if we're maintaining ComputerPlayer's decision logic (as opposed to Computer Player7).
