Added M118 message forwarding

[digant73]

IMPROVEMENTS:

• Added M118 message forwarding: Any M118 command read by TFT (e.g. printing from TFT or from remote host (e.g. OctoPrint etc.)) is parsed and forwarded to the provided TFT destination port/s, if enabled.
  This feature allowed an easy implementation (just an M118 message) for:

  • FR [FR] Send Pause and Stop Command While Remote Printing #2572 (reported below as next improvement)
  • FR Execute command for Nextion with M118 gcode. #2618
  • FR [BUG] M118 Commands do not go through to ESP3D when using repo code (not release). M118 commands work fine in all other scenarios #2638

  The new Serial_Forward function was added to the existing SerialConnection API

• Implemented [FR] Send Pause and Stop Command While Remote Printing #2572: Now, as also reported in README.md, when on Printing menu, pressing on the pause, resume and stop buttons will trigger to the remote host the following notifications, respectively:

  NOTIFICATION	ACK MESSAGE
  pause	//action:notification remote pause
  resume	//action:notification remote resume
  cancel	//action:notification remote cancel

  The remote host must properly handle the received notifications. For example, if //action:notification remote pause is received then the remote host must effectively pause the print and send M118 P0 A1 action:pause in order to trigger the pause action to the TFT.

• Serial functions syncL2CacheFromL1 and parseRcvGcode moved from parseAck.c API to SerialConnection.c API and renamed as the following, respectively:

  • Serial_Get (retrieve a message)
  • Serial_GetFromUART (retrieve messages from all the enabled supplementary ports storing them in the command queue (in interfaceCmd.c) for further processing)

• Serial functions in HAL's Serial API properly renamed (common naming convention) as:

  • Serial_Put (send a message)
  • Serial_PutChar (send only a char)

• Beeing part of the main changes of the PR, some code reduction and cleanup has been also provided in interfaceCmd.c:

  • infoCmd data queue renamed to cmdQueue (by definition the word cmd (command) means a set of info). Used cmdQueue instead on cmd_queue due it is not a primitive type (e.g. an array of chars) but a data structure (the use of _ and further . (for an attribute) would result in a less readable text
  • Grouped M25, M125 and M524 (code reduction)
  • Grouped M105 and M155 (code reduction)
  • Some code sharing, reduction and fixes applied on top of last merged PR Handle emergency commands #2607. Also, no need to handle M108, M112 etc. as emergency commands when sent from command queue (Marlin will always replies with an "ok")

• Beeing part of the main changes of the PR, some code reduction and cleanup has been also provided in parseAck.c (e.g. dmaL2Cache buffer renamed to a more understandable ack_cache (an array of chars) etc.).

fixes #2640
resolve #2572
resolve #2618
resolve #2638

PR STATE: Ready for merge

[digant73]

@kisslorand Please, have a break with such kind of meaningless complaints. They contribute only to damage the project and the community. Thanks!

[kisslorand]

@bigtreetech
Please check #2685. Thank you!

[digant73]

Closing just to avoid any infinite loop. This PR will be eventually submitted/adapted in the future once kisslorand's constraints will be satisfied or rejected

[digant73]

Reopened after removal/solving all kisslorand's comments from code