Difficult bridging edition

known bug

• dense infill is at 100% instead of 40%, fixed in the nightly and next release

new

• bridge_overlap fix & redesign (now bridge density)
  • now has a min setting.
  • The density is now chosen between the two values to try to cover as much as possible the area to bridge, with the highest density possible.
  • Remove the hardcoded invisible 87.5% density modifier. Replaced by setting by default the max at 90% and min at 80%
  • Try to place the bridge at the right position (only works if the shape is simple).
  • Known issue: the algo used for bridging can add a return line on top of an already extruded line. Have to do something about that.
  • If you want to get back the old behaviour, set the two values to 87.5
• Add total layer count in the gcode footer #1886
• Add current_position variable for gcode macro: current_position[0] is x and current_position[1] is y #1898
• updated Vertex profiles (from vertex)

fixes

• fix external_perimeter_cut_corners (was extruding too much at the second segment and not enough at the 3rd) #1903
• typo & doc update (thanks oretzl)
• Print & printer custom variables are now scalar and not arrays.
• fix retraction calibration when temp%5 != 0 #1881
• fix crash on monotonic #1889 #1893
• other bugfixes #1877 #1891 #66

note: I haven't tested the linux & macos build.
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