Cura Plugin - Dual Optimizer

Last Updated: v1.3 (Mar 4, 2017)

This is a Cura plugin designed for dual extrusion 3D printers
[Tested on Cura 15.04.6]
Features:
1. Swap the extruders only when necessary to save your time.
2. Print only the walls of the "prime tower" when the extruders are not to exchange.
3. Trim the used top layers of the "prime tower" when there are no further swaps. [optional]
4. Force to swap the extruders without changing filament spools. [optional]
5. Force to use either extruder #0 or extruder #1 without changing filament spools. [optional]
6. Scrubbing nozzle by specified extruders with individual counts, distance, retraction and extrusion speeds. [optional]
* Note: This is an experiment feature and could likely grind the filament.
Specifying the count of scrubbing with the extruder can make it to clean up the residues of previous filament from nozzle. However, repeated retraction and extrusion on the same position of filament could make it ground.
* With zero scr