Improve webtrekk detection
Improve webtrekk detection

The variable `webtrekk` is only present on a few websites, it seems.
Adding a bunch of other Webtrekk variables to improve detection

WPO-Foundation/Wappalyzer,WPO-Foundation/Wappalyzer,AliasIO/wappalyzer,AliasIO/wappalyzer,WPO-Foundation/Wappalyzer