Fixed violations (MD, Python, JSON, XML and more)

[peseoane]

They have been corrected again, adapting the following to the new code generated by @NComannder:

• Markdown syntax violations.
• Python 3 syntax violations
  • In addition, the imports have been tidied up
  • The code, without altering its functionality, has been formatted for better readability, as this is the philosophical purpose of Python 3.
• XML syntax violations
• JSON syntax-structural violations

The problem in merging the branches was the absence of a file that has been deleted. Now it's fixed.

[peseoane]

Dear Sir,

For my part I did not want to comment on import lines not in use, I just limited myself to do the aesthetics and adapt the code as much as possible to adapt the mentioned, JSON, XML, SVG, Python... to the standard, especially Markdown to improve future documentation.

This removes many warnings and errors from the debugger, Markdown is weeeak, but has a lot of rules in "how-to" write... , and facilitates maintainability of documentation and readability of the code (perhaps this is a personal opinion).

I hope it's useful, I understand that programming live is very complicated.

I wish you the best, Merry Christmas.