Code-corrections and cosmetic changes

[buffcode]

This PR fixes the way links are generated during the redirect. Previous version did not support the "custom link parameter" setting by Typo3. When "permanent" is not checked, the extension will now emit a 302 "Temporarily moved" redirect header (previously always was 301).

Further more many smaller changes were made to clean up the code (removing comments, correct indenation, phpDoc comments).

Feel free to merge, used in production.

[bobosch]

Thanks for your help. I like to merge your program update and some cosmetic updates.
Unfortunately you have mixed up the cosmetic changes with the program changes in one commit.
Could you please send me a commit / diff with the program changes?

• Spaces between commands and variables are good.
• Space indentation has two disadvantages:
  • Every coder has a different attitude how much indentation. If you use tabs, everyone can configure the tab indentation in his IDE or file editor.
  • They makes the file bigger
• The curly brackets should be in the same line

Please also take a look at the TYPO3 coding guideline https://docs.typo3.org/typo3cms/CodingGuidelinesReference/PhpFileFormatting/PhpSyntaxFormatting/Index.html