Config Screen

[rilifon]

Depends on #59.

• Effect Level (0 - 550(?) MAX_PARTICLES on screen (not counting important particles)
• Fullscreen/Windowed/Borderless Toggle
• Mouse capture (options: on, off, only on when in-game)

[rilifon]

Made only gamepad screen, but config has its own screen

[rilifon]

Added fullscreen and mouse capture to config screen