Merge branch 'develop' into feature-spells
KnownSpells implementation fix

* merged KnownSpell/KnownSpells
* moved HeartstoneSpell to KnownSpells.php
* extended CharHelper::teleport() method
* fixed Char->kill() (to use CharHelper::teleport method)
* heartstone castability now resolved by HeartstoneSpell class (was
hardcoded into controller)