[FR] Remove EMERGENCY_PARSER Error/Warning

[thisiskeithb]

Sept. 9, 2020 edit: With MarlinFirmware/Marlin#19279 and MarlinFirmware/Marlin#19281, EMERGENCY_PARSER is now fully supported on STM32F1 (SKR Mini 1.1, SKR Mini E3 DIP 1.0, SKR Mini E3 1.0, SKR Mini E3 1.2, SKR Mini E3 2.0).

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EMERGENCY_PARSER is not implemented for STM32/F4 STM32F1, which make up a large chunk of BigTreeTech's board lineup:~~

STM32F1-based boards without support for EMERGENCY_PARSER:

• SKR Mini 1.1
• SKR Mini E3 DIP 1.0
• SKR Mini E3 1.0
• SKR Mini E3 1.2
• SKR Mini E3 2.0

STM32/F4-based boards with support for EMERGENCY_PARSER (Support added 5/25/20. See MarlinFirmware/Marlin#18095):

• SKR Pro 1.1
• GTR 1.0
• BTT002 1.0

LPC1768/9-based boards with support for EMERGENCY_PARSER:

• SKR 1.1
• SKR 1.3
• SKR 1.4
• SKR 1.4 Turbo

Please consider removing this error/warning from the firmware and add it to the readme instead as it causes a lot of posts in the various support groups on Facebook & GitHub.

This is especially a pain because I've helped several users after they've updated to the latest firmware from this github repo (based off 56f9040) and the error/warning does not go away after dismissing it, power cycling the TFT, creating a reset.txt, etc. like it should.

Until Marlin supports EMERGENCY_PARSER on STM32F1, there's nothing users can do.

Tagging @guruathwal and @bigtreetech for visibility.

[thisiskeithb]

Closing since the warning was removed.

[thisiskeithb]

With MarlinFirmware/Marlin#19279 and MarlinFirmware/Marlin#19281, EMERGENCY_PARSER is now fully supported on STM32F1 (SKR Mini 1.1, SKR Mini E3 DIP 1.0, SKR Mini E3 1.0, SKR Mini E3 1.2, SKR Mini E3 2.0).

[github-actions]

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