Kiri:Moto todo

`C` cosmetic, `F` functional, `P` performance, `B` bug fix

B restore settings should restore all mode/device/settings (find corner cases)
F implement an in-app bug reporting system
F extend mesh object to store raw + annotations (rot,scale,pos)
```
share raw data w/ dups, encode/decode
```
P bail on decimation if it's proving ineffective
P improve decimation speed by avoiding in/out of Point?
P server-side processing (determine protocol and storage)
P refactor / simplify POLY.expand (put onus on collector)
P cloned objects should share same slice data unless rotated or scaled

B check for support / brim intersections on first layer
F detect M82 / M83 in the gcode header and use appropriate setting over device
F manual support addition / control
F polishing and other non-planar work
F gradient infill https://www.youtube.com/watch?v=hq53gsYREHU&feature=emb_logo
F first layer segment large flat areas for better fill reliability
F adaptive column to compensate for fine or layers that finish too quickly and melt
F apply finish speed to exposed top and underside flat areas
F expand internal supporting flats
F first layer support speed should be same as shell speed
F add lay-flat auto-rotation or from selected face
F determine start point from gcode preamble
F trim support offset from layer below
F feather sharp tips by reducing extrusion in area of overlap
F multi extruder and swapping extruder support
F option to support interior bridges when 0% infill
P disable infill fingerprinting for gyroids
P refactor thin fill to use outline and inside poly normal dist to self

B fails in pancaking (clone) when there are no sliced layers (like z bottom too high)
B linear finishing should extend beyond part boundaries by tool radius
B outside cutting direction in roughing mode inverted
F use arcs to connect hard angles
F do not rough areas that go all the way through the part https://github.com/GridSpace/grid-apps/issues/20
F send gcode to cncjs
F lead-in milling
F trapezoidal tabs (in the Z axis)
F ease-in and ease-out especially on tab cut-out start/stop
F implement z line-only follows for ball/taper
F add option to spiral in vs out (optimal tool life) vs mixed (optimal path)
F add endmill spiral direction to fully respect climb vs conventional
F add support for tapered ball mills
F warn when part > stock or cuts go outside bed
F add M03 tool feedrate support
P refactor slicing around flats w/ interpolation instead of culling
P optimize away topo generation (for z hop/move) when part is flat
P store tab and camshell polys in widget.topo to minimize z on edge moves
P linear finishing is going back to z top too often
P option to skip milling holes that would be drilled
P crossing open space check point is outside camshell before returning max z
P background worker to speculatively generate topo maps (and maybe pre-slicing)