Additional grid fill options

[psychedelicious]

The grid should be able to be populated in interesting ways.

Flood

Fill the whole grid

• [ ] Alive fill
• [x] Dead fill (empty)
• [x] Random fill

Lines

• [ ] Thickness
• [ ] Spacing
• [ ] Angle (vertical, horizontal, others?)
• [ ] Dotted

Options

• [ ] Replace existing fill vs layer on top (e.g., do dead fill cells "kill" existing cells or are they ignored?)