Measure print head and change shape of it's collision object in planning

• Measure print head dimensions
• update urdf collision object shape for print head
• update plans

changed milestone to %3D planning env setup and Greedy Scheduling

added enhancement hardware labels

mentioned in issue #58 (closed)

mentioned in issue twins-controller#5 (closed)

At home orientation:

• 13cm towards other robot (centered)
• 15.5cm vertical (centered)
• 10cm to each robot's right, 13cm to each robot's left (not centered)

marked the checklist item Measure print head dimensions as completed

mentioned in commit 31d66b66

marked the checklist item update urdf collision object shape for print head as completed

changed the description

closed via commit 31d66b66