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Investigate MK2.5S TZB firmware feasability #161

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This pull request is to hopefully initiate consideration of a MK2.5S compatible variant of the lastest TSB MMU2s firmware. Unfortunately my technical ability in coding is nearly zero, but I will be happy to support through detailed testing.

…even if small resistance from blade.

More robust home_selector() function with SG tweaked to allow homing even if small resistance from blade.
Remove 500ms delay on button press, so much more responsive now ;-D
Considering only normal mode e.g. SpreadCycle
TOFF decreased to 1 from 3 to aid in less noticeable noise when holding.
RNDT increased to 1 from 0 to aid in less noticeable noise when holding.
Freerunning enabled on pulley when disabled.
Pulley disabled after first init.

Missed a line when copying lines to home_selector, fixed, should now compile again
Tuning more reliable with SG for IDL&SEL.
Idler SG tweak, from cold it was still loosing steps, bit more sensitive now, still to test from dead cold start.
Karl's Rework to continue improving
reset_position after rehome on stall implemented
Karl's Rework to continue improving, reset_position
Extensive clean out of deprecated methods.

moveSmooth() has replace almost all motion requests, loading/unloading and general filament manipulation testing to follow to ensure speeds/acc etc. line up and are functional.
Rewrote unload, load with moveSmooth for acceleration and finda sense.
tested working at this stage
Removed Bowden Length Cal - Cleaning Code
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