Save flash - use DEBUG for SERIAL (UBL)

[classicrocker883]

Description

Changing SERIAL_ECHO* to DEBUG_ECHO*
Add option to disable serial output for UBL in ubl_G29.cpp results in saving ~1976 bytes (previously 1432) using new DISABLE_UBL_SERIAL_CHITCHAT

• Also adds DEBUG_ECHO_SP to debug_out.h
• add weight_factor to static void smart_fill_wlsf(const float ) and
  TERN(AVR_ATmega2560_FAMILY, __O2, __Os); // O2 gives smaller code than Os on A2560

Probably some serial echo could be kept, after all DEBUG_LEVELING_FEATURE is "detailed logging of G28, G29, M48, etc.".

Tip

Thoughts?
Comments?
Suggestions?
Changes?

Requirements

Benefits

• Keep original integrity
• Save flash if needed
• Fix/improve on DEBUG_LEVELING_FEATURE / VALIDATE_MESH_TILT

Configurations

Related Issues

there are multiple errors when VALIDATE_MESH_TILT is enabled (in ubl_g29.cpp) - such as gotz and probe_pt are undefined.
this PR does fix that by rearranging the values

[ellensp]

Many advanced users do not use displays, they are far to limiting.
This PR looks like it makes normal command line use of ubl_G29 without a screen impossible.
Many of these are not debugging they are basic operations for serial gcode operation.

Now if you where to add a feature to advanced eg "DISABLE_UBL_SERIAL_CHITCHAT" or something like that I think this would be a better option than redefining it all as debugging. the user gets to choose if they want it or not.

[classicrocker883]

so far reverted the DEBUG from SERIAL to have DISABLE_UBL_SERIAL_CHITCHAT option instead.

one thing I found is VALIDATE_MESH_TILT could not work as is. see Issues in description.
I made changes to rearrange/fix it.

[classicrocker883]

all seems well, just not sure if DEBUG_SYNCHRONIZE() should be used in place of planner.synchronize()