Huge balance changes

Increased Monster Density at later levels.
- Monsters can spawn in packs at later levels.
Decreased chest spawn amount by 1.
Disabled Mana Potion spawns for current game state.
Monsters now scale faster with Maze Level increasing overall difficulty.

Mana costs of all abilities now scale with Maze Level, meaning bonus MP
is no longer OP!
Lesser heal: Reduced Defense buff from 15% to 10%. Added buff to Agility
(10%).
Added two new abilities!
Demoralizing Shout: Reduces the combat effectiveness of your target and
nearby targets by a scaling amount, up to 25% (stackable.) Generates
mana.
Life Tap: Restore mana equal to 100% of your current hp but sacrifice
50% of your current hp. Provides a 90% buff to Defense for 6 seconds.

MISC:
Fixed beginning music location (blank sound) and disabled wait timer.
Adjusted Character Creation screen for larger description box and added
information on buff and debuff stacking.