Always define MIN_Z_HEIGHT_FOR_HOMING even if 0
Always make a potential rise to `home_offset[Z_AXIS]` possible in G28.
Get rid of some very ugly constructs in MBL (ultralcd.cpp).

Includes:
  *firmware version / branch / date.
  *extruder count
  *board information (name, serial details, power supply type)
  *thermistors (names, min/max temperatures)
  *printer statistics (PRINTCOUNTER details)

Thanks to @thinkyhead for contributions.

See https://github.com/MarlinFirmware/Marlin/issues/4088

Makr the call of   `manage_manual_move() ` depandent of `ULTIPANEL`

- `per_sq_second` => `per_s2`
- `per_sqr_second` => `per_s2`
- `axis_steps_per_sqr_second` => `max_acceleration_steps_per_s2`

Based on MarlinFirmware/MarlinDev#200 from @eboston

- In `stepper.h` init `count_direction` array
- In `ultralcd.cpp` init `autotune_temp` array

The LCD menu items for SD printing pause/stop have been updated to control
also the print job timer. This commit also fixes a small output bug with
M78, the failed print counter was displaying the wrong value.

Speedup sreen update delay
and correct a comment.

A module division by 10 is slooooow. (powers of 2 are fast - but then you can AND a bitmask with the same result)