Add offset commands

[psyvision]

Implements:

• SET_GLOBAL_OFFSET [X=<pos>|X_ADJUST=<adjust>] [Y=<pos>|Y_ADJUST=<adjust>] [Z=<pos>|Z_ADJUST=<adjust>] - Allow a global offset to be applied, e.g. to adjust the z-offset during the first layer for a better first layer
• SET_TOOL_OFFSET TOOL=<tool> [X=<pos>|X_ADJUST=<adjust>] [Y=<pos>|Y_ADJUST=<adjust>] [Z=<pos>|Z_ADJUST=<adjust>] - Allow an individual tool offset to be applied, e.g. to adjust a tools offset mid-print
• Passes toollock object to pickup and dropoff macros alongside myself so the global_offset property can be read and applied, e.g. SET_GCODE_OFFSET X={toollock.global_offset[0] + myself.offset[0]} Y={toollock.global_offset[1] + myself.offset[1]} Z={toollock.global_offset[2] + myself.offset[2]} MOVE=0

[TypQxQ]

This looks awesome! Could you also add to the README.md? I have no way to check this because I took the kids away for a one week vacation but it all looks good :)

[psyvision]

Added the command information to the readme and gave it a test this morning, printing in progress now.

[TypQxQ]

Great work!