Auto-Height functionality (v2)

Thanks for the input on the first pull request, hopefully, this time it's better.

The auto height option sets the extruded height for a specific polygon based on its ID. If the polygon's ID is in either name_NNN_mm or name_NNN_NNN_mm format, the NNN_(NNN_)mm part of the name is translated into height in milimeters.

Otherwise, the height parameter is used

Examples:
  rect543_1_mm -&gt; 1 mm height
  poly456_12_5_mm -&gt; 12.05 mm height
  circle2345_3 -&gt; according to the height parameter