Some mesh debugging.
Made stl save of mesh group put all the meshes into the stl.
Merge pull request #2 from jlewin/development

Display ttyACM* devices in Serial Port list - Fixes #80526182
Put in colors for different retraction on different extruders.
Merge branch 'development' of https://github.com/MatterHackers/agg-sharp into development
Took out some dead code.
Made it possible to save and amf to stl while selecting what material will save.
Make sure we keep track that mashes after being transformed do not have sorted Vertexes.
Make sure we remember what material a mesh is using when we copy it.
Put the sort vertices into mesh
Made centering for rotation preserve the current position in ScaleRotateTranslate
Made amf load not relocate any parts.
easier debugging.
Don't make extra copies.
Make default material 1