Dungeon Loot - dungeon crawler

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- dungeons shortened on 10 floors each for shorter sessions
- new dungeon encounters
- new enemy
- new rewards
- added Gold tile
- new greenish dungeon theme
- drains less battery on high-end devices
- cleric's heal is on autocast, finally:)
- exit dungeon button is no longer in a way and needs confirmation now. Sorry guys;)
- barrels explode!
- bugfix: reward no longer can be claimed multiple times
- better protection against cheaters