Alpha3 under way with a lot of new features

[rvmn]

Alpha3 will have alot of new features among at least are certain right now are:

• Arc infill in concentric mode using 'pedestal' detection, with this you can finally print fullxyz printing like 90degree demos with a loop
  

• Arc infill gap/hole strategy; the Arc waving feature: if a hole is found or another threshold is met the arc will start 'going into a wave' to make sure there is enough contact area between layers for solid overhang printing.
  

A demo of the development version as it works now:

[rvmn]

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