Resolved some warnings in Marlin_main.cpp regarding compares of signed and unsigned integers by replacing 'int' or 'uint16_t' with 'uint8_t'.

and cleaned typo.

- Address Issue #1682 at hash #issuecomment-89756858

Should be `retracting` and not `retract`

- Document `manage_inactivity` function
- Allow `EXTRUDER_RUNOUT_PREVENT` to work with all extruders
- Use faster `memcpy` for copying coordinates

max_feedrate is in mm/s. line_to_destination needs a feedrate in mm/min because there is feedrate/60.

related to current_position[Z_AXIS] and retract_zlift.

'+ =' -> '+='

Fix for #1786

- Add comments documenting `thermal_runaway_protection`
- Add an enum for the thermal runaway states
- Add macros for temperature helper functions
- Fix a glitch with the z probe sled in homeaxis

* Use "G29 S3 Xn Yn Zn.nn" to modify bad probed point manually
* Changed manual Z steps from 0.05 to 0.025 and made brought it to Configuration.h

Updated documentation in Configuration.h.
Cleaned up and commented some code relating to Z_PROBE_ENDSTOP.
Separated Z_MIN_ENDSTOP and Z_PROBE_ENDSTOP completely.

- Include the current Z when raising the axis after and between probing
- Add `sync_plan_position_delta` for parity with `sync_plan_position`
- Clean up and clarify `M48`, `dock_sled`, and others

* Added MSG_END_HOUR and MSG_END_MINUTE labels to all language files.
* Available translations:
  EN, FR, DE, ES, IT, PT, PT-BR.

The current position needs to be updated by using the inverse
`plan_bed_level_matrix` on X, Y, and Z. All moves in the planner are
transformed by the `plan_bed_level_matrix` from this point forward.

Code to raise the probe before retraction is good, but the code should
always raise the probe, not just when retracting

- Addressing issue #1741

Documented some additional areas that should be addressed if Z_PROBE is
fully separated from Z_MIN or Z_MAX.
Fixed a documentation error in sanity checks. Servos start at 0 not 1.

This rolls back to commit 06f767d608.

- Some messages should not expire with `PROGRESS_MSG_EXPIRE`.
- Simplify conditional for progress bar with sanity checks.
- Rename `messageTick` to `expireStatusMillis` and make it the expire
time.

Fix for #1460.

Seems to work with only one extruder. Can't test this myself with more.