G30 - Single Z-Probe

1.0.0-beta calibration Probe bed at current XY location HAS_BED_PROBE

Do a single Z probe at a specified position. By default probe in the current position.

Use SERIAL_FLOAT_PRECISION to set the number of decimal places in the output.

G30 [C<bool>] [E<bool>] [X<pos>] [Y<pos>]

`[C<bool>]`	Probe with temperature compensation enabled (`PTC_PROBE`, `PTC_BED`, `PTC_HOTEND`)
`[E<bool>]`	Engage the probe for each point
`[X<pos>]`	X probe position
`[Y<pos>]`	Y probe position