mod_url relics in the code

[mudrd8mz]

I understood from the code and the README description that the mod_url module has been used as a base for the development. However, I noticed there are a few places that still refer to the URL module functionality even if there is no real point for it any more. I think it deserves some cleanup to make the code readable.

Examples include:

• The view.php accepting the $u parameter (with the "URL instance id" comment)
• The view.php creates the $url variable to hold the instance of the "msteams" module.
• Excessive and useless usage of the mod_url logic such as

  $displaytype = RESOURCELIB_DISPLAY_EMBED;
  if ($displaytype == RESOURCELIB_DISPLAY_OPEN) {
  $redirect = true;
  }

  etc.

[rschrenk]

I have gone through the code, renamed variables accordingly and removed obsolete code commit be72e5560473e594d9766755fee971b08cc2a0b6