Updating main menu, music and more

Hey!

I just released v0.9.13 for you! It's a wild ride for me, so hang on there, will ya? :D

Changelog:

• Mob AI/Pathfinding was improved, they now smell you from farther away
• Removed the end turn dialog, it was kind of annoying
• New music was added
• Main menu rework for PC
• Changed window style for whole game
• You can now go back to previous menu by using [ESC] or [EAST] button on your controller

Bugfixes:

• Fixed the map flickering issue (so the horizontal/vertical gray bars aren't visible anymore)
• Fixed the bug where you could press "swap cards" before the cards shown up. This caused unintended behaviour.

Enjoy! <3