Update 1.2.09103

[p]This update addresses a few more QoL issues and bugs:[/p]

• [p]Ctrl+Z no longer also triggers the Z zoom hotkey.[/p]
• [p]Added a mousewheel sensitivity slider to the settings menu.[/p]
• [p]Added multiple backups for replay saves.[/p]
• [p]Reworked the undo system, so that it behaves more naturally.[/p]
• [p]Tweaked the text in the how to play popup to clarify some common misunderstandings.[/p]