style tweek to the footer
changed the opacity and positioning of the grid lines

this makes them render in a slightly nicer way
show preview of currently selected color
color preview thing is refactored to look a bit nicer
bugfix: initial color set should trigger event
bugfix: rows + cols count should always be ints
show debug info in the top left of the grid
bugfix: change get cells method, so that the edges are no retreived twice