Image compression and command line option to drop alpha layer

[uolamer]

Currently Proximity is saving the PNG in RGBA with no or very little compression. The Alpha is needed for people making frames to then edit later but for many use cases it would be nice to have the option to drop the alpha layer as an option.

This is some example file sizes:
Lightning Bolt - base M15 template
10.8 MB - PNG - Fresh from Proximity with Alpha layers. RGBA
6.99 MB - PNG - Just optimized the Proximity image keeping the alpha layer
6.20 MB - PNG, no alpha, max compression

I did this compression using Pillow in Python and had basically the same numbers from Photoshop saving the file.