Issues in V3

[NinthDesertDude]

These will be scratched off whenever addressed.

1. Turning default loaded brushes on or off changes the active brush unexpectedly (it has to do with the chosen brush index probably not being updated).

2. Names added to the brush picker will be added horizontally.

3. The horizontal, vertical, and both symmetry modes aren't counter-rotated when drawing on a rotated canvas.

4. The code that loads brushes redraws them with various incorrect settings including off-by-one alpha errors due to using ConvertToPremultipliedAlpha(). Make sure it draws the exact same as it should be.

5. Normal blending with hsv mixing is weird unless rgb/hsv jitter is on, then it only acts weird when random min alpha is also on. It filters the color out very quickly to produce white more often than it should. Probably a premultiplication error again.