Arena update

Arenas often felt like waste of time due to reward from them wasnt granting any long lasting effects. Especially in early levels weapon you got wouldnt be very useful after next zone. So i decided to add new arena buffs.  Now each arena has unique arena buff that will give small bonuses for different things.  Also factory arena felt bit too hard so i made it bit easier.

• 7 new arena items added
• Arena rewards reworked (Now you can choose between 3 options)
• Factory arena reworked (Maximum number of enemies reduced from 4 to 3 and spawnrate decreased slightly. Also increased arena size so bosses would fit in better)
• Item description boxes are no longer affected by darkness
• Some other small fixes