1a. Make `costs`, `manaCosts`, and `manaCostsToPay` private in `AbilityImpl` with access through getters/setters
1b. fix cost adjuster for imprinted cards affected by the above
2a. Lazy instantiation for rarely used `data` field in `TargetPointerImpl`
3a. Pre-allocate certain array sizes in `Modes` and `CostsImpl`
4a. Make `manaTemplate` private in `BasicManaEffect`, copy when passing outside the class
4b. Don't copy `manaTemplate` in copy constructor since it doesn't change
4c. Add comments explaining copy usage for `manaTemplate`
4d. Remove redundant variable assignment and make fields final
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Co-authored-by: xenohedron <xenohedron@users.noreply.github.com>
