v77 - 2020-10-21

Mingw: as getting updates for a complete, compiled and ready-to-use toolchain becomes difficult (no new release since more than 2 years on SourceForge), I was looking for an alternative.
So I recently found out the releases of "LH_Mouse", a contributor of the project who has his own website: https://gcc-mcf.lhmouse.com/
The version change of GCC involved various small changes in both the source and the compilation script, but now everything works fine.

Another important change is that the critical errors are now displayed in message boxes instead of the console. This allows to close the console without worrying about important messages.
For read/write requests, the ability to retry is now given by these message boxes. This could help for instance in case of punctual hardware failure.

I also added an option (-font) to change the console font and colors. This option requires Vista and is ignored on Windows XP.