Custom background images!

• Currently under ‘Experiments’.
• Ticking the checkbox will open a file picker and then let you crop your chosen image.
• Currently only JPG and PNG files are supported.
• Images are centered on screen. Small images will be scaled up if necessary.
• If you want to choose a new image, untick and re-tick the option.
• This is a temporary arrangement and will be replaced with a nicer setup soon.

Bug fix: Spawning rate is now constant regardless of how many system types are enabled.

Settings menus:

• Bug fix: Settings menu icons on the toolbar no longer turn invisible after device rotation.
• Bug fix: No more weird double or mysterious colour-changing ripples..
• Minor layout and animation tweaks.