Store colors in human-readable form

lol, how did it manage to work for years? (z1 - z2 * z.Round) shouldn't respect signs of z1 and z2. It turns out we often had arbitrary .Frac value in division result. Also fixes issue #613.

Switch to 'settings.ini'. Copies old ini file if necessary on startup.

why would we ever want to divide by 0?

hwFloat division is ~1.6 times faster now

Trivial optimization. Wonder if compiler was smart enough about it.

add hedgehog tp svg as reference (as requested by nemo). feel free to improve :P

Fix issue #603

Implement issue #308 with '|' as separator

let's go with what nemo suggests