Rewrite - Insert At Layer Change

[GregValiant]

This is an extensive re-do of the script.

• Added an 'Enable' setting
• Added support for multi-line insertions (comma delimited)
• Added insertions in a range of layers or a single insertion at a layer. Numbering is consistent with the Cura Preview (base1)
• Added frequency of Insertion (once only, every layer, every 2nd, 3rd, 5th, 10th, 25th, 50th, 100th)
• Added support for 'One at a Time' print sequence
• Rafts are allowed and accounted for but no insertions are made in raft layers

Description

Added flexibility for the script

• [ X] New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• [ ] Test A -
• [ ] Test B

Test Configuration:

• Operating System: Windows 10 Pro (Intel processor, NVidia graphics)
• Cura 4.13.1, 5.5.0, 5.7.1

Checklist:

• [ X] My code follows the style guidelines of this project as described in UltiMaker Meta and Cura QML best practices
• [ X] I have read the Contribution guide
• [ X] I have commented my code, particularly in hard-to-understand areas
• [ X] I have uploaded any files required to test this change