Thermometer class plus the changes necessary to implement it
added maximum rotation of preview and resetted height and rotation when a new doodle is made
updated Thermometer code (should be final for now)
Merge branch 'master' of https://github.com/Doodle3D/doodle3d-client

# By peteruithoven
# Via peteruithoven
* 'master' of https://github.com/Doodle3D/doodle3d-client:
  Always dump gcode in textarea