Feature request: snap-to-grid

[ratkins]

Doing the hand-clicky-clicky to generate a pixel map with the PixelBlaze mapping tool can get you into a situation where your theoretically "regular" pixel layout is off by small amounts due to parallax or just how a wearable sits on the floor/hangs from the chair you took the photo of it on.

It would be nice to be able to specify a grid dimension (say 8×8 pixels or whatever, maybe even different sizes in each dimension) and have led-mapper quantise the pixels to that grid and allow you to export the quantised pixel map back to PixelBlaze or FastLED.

[jasoncoon]

I look forward to your pull request adding this feature. 😜