fix baseUrl and an simple fix for multiple types in an param (in v2\explorer)

[timmit-nl]

I have noticed the baseUrl doens't work as I would expect (remove it from the path to check for the correct route).

This fixes that.

Also we have some issues with multiple types of an param in Explorer v2:
/**

• test function
• @param string|null $testVar
• @return void
  **/
  testFunction(?string $testVar) : void

So the quick fix is to only gets the first type.

And my editor fixes some PRS12 incorrections when I saved the file. It makes it better to read, so I left them.

[timmit-nl]

this last commits is that if you use a baseUrl with domain (like the tool will generate if not there, so I think it is the propper use) it strips it from the path. So you get an clean path.
Also an fix that if you use a baseUrl without domain you get a notice in src/Explorer/v2/Explorer.php

[timmit-nl]

I will close this one as I have a new clean version of only the baseUrl problem: #671