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Show correct compiler error message in UART0.cpp

Add CI workflows

Cross checked with the files UART1 to UART3, only UART0 needs the fix.

Correct size output for const variables

avr-size reports const variables in .rodata. 
recipe.size.regex did not check .rodata when totaling up flash usage. This would result in the reported size of the sketch not including variables that were declared const; it was possible to make a sketch that did not fit in the flash, but where this wasn't detected until it got to avrdude during the upload process, and avrdude dutifully reported that it was trying to write to addresses that were out of range. 

See the big discussion over here when I encountered this in megaTinyCore (and @MCUdude discovered that this happened on the official megaavr boards too) https://github.com/SpenceKonde/megaTinyCore/issues/95

Changed operator bool to explicit rather than implicit conversion in Serial

Remove PROGMEM attribute and pgm_read_byte Not needed since the megaAVR 0-series have a unified address space. Using pgm_read* will only increase memory usage

megaAVR 0-series have a unified address space so forcing a const string in flash just increases flash occupation with no benefit on RAM usage.
Fixes #53

Fixes https://github.com/arduino/ArduinoCore-megaavr/issues/40

[MuxTO] Reset 4809 on baudrate change / port open

* Fix bug in baudrate compensation. The code is now in accordance to the
data sheet. The previous code would in effect either apply twice the
compensation, or apply no compensation, depending on the polarity of
the compensation.

* Improve readability of expression for baudrate compensation.
It is now exactly the same as in the documentation.
The net result is the same as the previous version.

* Since we have code to correct for errors in F_CPU to generate
the right baudrate, then we should use F_CPU, the specified CPU
frequency as basis, not the F_CPU with whatever corrections.

* adds UNO like mode
* changes the reported fw version to 1.07 (M_MCU on verbose avrdude)