* it is possible now to add casts and shoots OTF (f.e. with spell bonus)
Centralized stack 'ammo' loading from bonus system.
* introduced small proxy class for local bonus cache
(no need to use global cache if particular selector used on node only in one place)
* handle killing resurrected creatures
* use IBonusBearer::MaxHealth() where possible
* Fixed https://bugs.vcmi.eu/view.php?id=2486
* Possible fix for 0 HP after resurrection.
* Hack-fixed https://bugs.vcmi.eu/view.php?id=2584
* Unified CStack health API
* Use CHealth for CStack count and health points
* increased SERIALIZATION_VERSION
* Moved SUMMON_BOAT special case to mechanics
* Partially moved Town portal logic to mechanics class
* Added generic query reply to CCallback
* Redesigned Queries so that base API do not depends on CGameHandler
* Got rid of CGameHandler::castSpellRequest
* Removed CGameHandler::castSpell
* Added new Query type for town portal dialog (not used yet)
Bonus * -> std::shared_ptr<Bonus>
This cures the following problems:
1) Memory corruption at exit. Some Bonus-es were deleted twice (mods?).
2) Memory leaks. Some Bonuses were not deleted.
3) Reduce the number of "Orphaned child" messages.
Valgrind reports 0 leaked memory now and no invalid reads/writes.
