Removes some minor GCC warnings

Adds utility.h

Updates u8glib's bmp2hex converter

General cleanup: enum

Introduce line_to_axis_pos() for use in homeaxis()

Follow-up the PR #4335 (Debug char, fix compile errors for lcd pins)

and use it in `homeaxis()` instead of `do_blocking_move_to_axis_pos()`.
`do_blocking_move_to_axis_pos` was wrong because it performed subdivided, delta-corrected moves for x- and y-axis.

The first common move for delta homing is like quick_home but for 3 towers.

Fix two warnings.

・Solve a flickering when SD card is inserted or removed at using a ASCII
LCD + language_kana.h

Update Japanese translation (work in progress)

Fix position shift with MBL

Follow-up the PR #4163 (Mixing and Switching Extruders)

Use blocking_move, current_position in G28 homing

・Update forgotten K8400 files

Wrangle feed rate variables

Debug char, fix compile errors for lcd pins

BLTouch probe sensor

Endstop invert flags as macros instead of const bool

ENDSTOPS_ONLY_FOR_HOMING is confusing

Update URL in createTemperatureLookupMarlin.py