Hide M117 with no LCD

Add gcode_line_error to reduce code size

Rename process_commands to process_next_command

Tweak to fan kick routine

NO_TIMEOUTS and ADVANCED_OK off by default

Allow lsDive to recurse with minimal stack usage

add plan buffer remaining for 'P' and block buffer remaining 'B'

Display unknown XYZ on the LCD as "---"

Use MSG_OK in M105

Use Mendel default for INVERT_Y_DIR

Consolidate arc code, remove motion_control.*

- Also show 2 digits past decimal for Z on DOGM

Formatting tweaks

Fix heating error message

Combine thermal runaway and watch-period

Split up prepare_move by type