Update v1.2

Changelog:

• Added camera zoom with scroll wheel in the combat phase.
• Increased the duration of the shop phase from 10 seconds to 17 seconds.
• Made only cages the player can afford spawn in the shop.
• Made the cage refresh its content between shop phases.
• Fixed an issue where surviving monsters would get faster between rounds.
• Fixed an issue where bought monster cages would reuse occupied slots.