Update stepper.cpp

Forgot Z2_MIN_PIN

Instead of changing SDEXTRASLOW variable to a slower speed,  the new
SDULTRASLOW is used for rigidbot panel.

• Removing trailing whitespace
• Adjusting indention for better readability
• Removing duplicated entries

//100k 0603 SMD Vishay NTCS0603E3104FXT (4.7k pullup) (calibrated for Makibox hot bed)

Caveat Emptor —- 
I’m not sure that this really makes sense,
but why keep someone from using it?

For some reason that I cannot determine, using a sub-function causes
the Tune sub-menu to act strangely, yet replacing the function call
with its code content works perfectly.

Make the output of M105 more similar to Repetier.
Make the text-print pert of M105 an extra function to make it reusable. `print_heaterstates()`
Use `print_heaterstates()` in M019, M190 and M303

st_set_position takes long
```void st_set_position(const long& x, const long& y, const long& z, const long& e)```

anything is long, we don't need float there

dx -> dsx
dy -> dsy
dz -> dsz
de -> dse

Fix status LEDs update when reinitializing the display

By using the regular update function during init.

Fixing #2683

by alternate definition for the callback macros

Move slow_buttons_update into the LCD_UPDATE_INTERVAL block
lcd_implementation_read_slow_buttons() will then be executed ~10 times a
second.

This is a back port of the correct in issue #248

Analog to https://github.com/MarlinFirmware/MarlinDev/pull/250 by
@RicardoGA

Restore the Babystep Multiplicator functionality and now it's available
for X/Y/Z