Added two new Sound settings for Tick sounds.

Separates the tick sound option into two, one for playing income ticks and one for playing spending ticks.
The constant ticking sound is quite annoying, and is something that is always mentioned when I show this game to friends. So I made this compromise, so that people can still hear when they get more money, but don't have to hear the ticks constantly.
I made my best guess on how to implement this visually in the settings GUI. Feel free to discuss my choice.