Add 3 New UI Settings

[TheSin-]

Description

• Add UI to set machine_start_gcode_first so that no gcode is adding infront of the start_gcode.
• Add float input box to set machine_extruder_change_duration which added proper extruder change times to the estimated print time.
• Add textbox to set machine_extruder_prestart_code to add gcodes that will run pre extruder change, things like heat up so we are at change before with pick up the next extruder.

Required for Ultimaker/CuraEngine#2114

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Printer definition file(s)
• Translations

How Has This Been Tested?

UI has been tested, Engine has not yet.

Test Configuration:

• Operating System: MacOS

Checklist:

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

[TheSin-]

Added a small fix to apply variable expansion to the extruder prestart code

[TheSin-]

Just having a hard time applying defaults to the Stealthchanger definitions

https://github.com/Ultimaker/Cura/pull/19333/files#diff-332a6d8c562113aa0e0654240c5a5602d8da4f81b58d00364f9e8cc4ce262656

and

https://github.com/Ultimaker/Cura/pull/19333/files#diff-6b841fe2c6a7e75eb9924ba3abc210631e2ff62ba6a8fcc0702113874496f7e1

isn't working, neither setting gets applied on create new, did I miss an other spot to be able to apply these by default on new printer creation? Any help here would be appreciated.

[TheSin-]

Updated for the latest code and tested, still I can not set these values when adding a new printer, but the options themselves to work. I can not figure out why they won't preset with a new printer though.

[TheSin-]

Update, the first extruder gets the proper defaults values, all extruders after that do need get the defaults from base, not able to figure out why it's not propagating to each extruder :\

Also the default value for start_gcode_first isn't auto checked on adding a new printer. Am I suppose to version up the definitions so they auto apply?

but everything else is tested and working now.