In case we find two gcodes closer than 0.01mm in Z, we estimate the layer
height from the first layers and group gcodes based on this layer height. The
logic seems fine and the code seems to work, but it's nontrivial and I'm a bit
worried that it might break things.

Moving all websocket communications out of the read thread callbacks (now async). Fixing threading issues with prontserve.

Breaks Tabbed mode for now

Cleanup whitespaces