Treat G90/G91 and M82/M83 like G53

[wilriker]

Currently it is possible to use a movement command prefixed with G53 to have this move performed in machine coordinates. I think it would be beneficial to have the possibilities with G90/G91 for absolute/relavtive axis moves as well as M82/M83 for absolute/relative extruder moves.

This would allow e.g.

G91
G0 X10
G90

to be condensed to just

G91 G0 X10

[dc42]

You can already use:

G91 G0 X10 G90

[wilriker]

@dc42 Great! Did not know that and honestly never tried.