delayMicroseconds redesigned

[LaZsolt]

No description provided.

[dbuezas]

Fantastic!

Another PR merge generated conflicts on this one.
Would you also add a line in the readme or a usage example?

[LaZsolt]

Readme and usage here:
#18 (comment)
and
https://github.com/LaZsolt/delayMicroseconds/tree/master/for_LGT8F

[LaZsolt]

Generally the usage of delayMicroseconds() not changed. The main difference is the lot of working frequency, clock tick accuracy and it's easy adaptable new code if needed.

[dbuezas]

Wow, fantastic. If you want, you can link to your pages in the readme.md or add an example file in the libraries folder.
I'll merge this now since I see that it just works with the clock selected in the menu.
So much assembler wizardry!

[LaZsolt]

Okay, I'll write few lines.