Snap selection start to the grid as well.
Add fancy toolbar buttons.

Icons are PNG version of Font Awesome.
Add Win mask and create separate file for constants.
Rename Mask.Buttons to Mask.Actions
Temporary FL mask function that just works on single chunks.

This makes it easier to do block transformations.
Add FL mask.

This seems to be working. I mean it does work, but I need to verify this with some
examples I guess.
Now with chaining masks.

FL Mask now inverts colors as one would expect it to.