New GCode Parser

One more mesh_index_to_npos update

Followup to #6827

G42: Fix and extend

- Also fix handling of SCARA and misuse of `codenum`.

Move G7 to G42

Use redraw flag for both types of LCD

See: #6777

missing enable for M605 for duplication mode

Make UBL a complete singleton

* UBL G29 -P3.1 mesh fill with distance-weighted least squares fit.

* Back to original -O0 on G29 for now.

Constrain LCD status message rendering

* Misc. Clean Up

Mostly UBL related clean up.
- But fixed a bug in the thermistortables.
- Made G26 more responsive to user aborts.
- Added sanity checks for older name for UBL_MESH_VALIDATION.
- Made G29 P4 able to edit invalidated mesh points
- Restore a reasonable Fade Height for UBL when creating new state information
- Get UBL's Topology Map to look a little bit better
- Make sure the user doesn't see a blank screen when doing Mesh Editing.

* Huh???   GitHub Desktop screwed up!

* get the planner object in scope

* Fix out of scope z_fade_height

* Travis timed out...

I need a change so I can force a new commit and sync.

I believe gcode_M605 will not be called when using DUAL_NOZZLE_DUPLICATION_MODE without this change.

Fix set_lcd_contrast

Cleanup code, organize & document fastio pin mappings

Changed UBL_G26_MESH_EDITING to UBL_G26_MESH_VALIDATION
Added UBL_MESH_EDIT_MOVES_Z to prepare for that change (coming next)

Reference: #6804

Add "live editing" option to LCD menus

Restore current temp accessors to float