Initial changes for single filament loading during Rep2X script
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Initial heat hold fix
Merge branch 'heat_hold_fix' into 7.5

Conflicts:
	firmware/current_version.txt
clear user_input_timeout everytime a heat_hold or user_input timeout elapses
MW-1099, Made ERROR_BOT_TYPE more abiguous
MW-1173, Fix for firmware 'unattaching' from build when bot type error occurs