Implemented Regex invert and revamped template validation

[TR1VER]

• Regex dots are now inverted, so file names will be clearer when used.
  • For example index.js will become index.js in the backend making the dot escaped.
  • To keep using regex use a escaped dot \. -> .
• Template validation is revamped
  • Instead of using templateIsValid() there is now tryTemplate(). This will try the template and throw an error if the template is faulty anywhere.
  • Template validation was implemented for structure tests also.