Add extension for tShirt folding
Moddified fitting to work with shirt model.
Temporary commit
Finish modification for tShirt folding.

  - add: possibility to load/save fitted model from/to file. Debuging reasons.
  - update: The usage of two unwraping methods in one script was removed.
  - change: The process of fold line creation for tShirt was completely recreated.
A fold line creation for towel was recreated.

  - update: Also checked and corrected towel folding after previous changes.
Merge branch 'dev_ModelExtension'