Attributes as reference and many fixes/improvements

- Changed Attributes: added new class AttributeVale which can change and
has a reference to the original Attribute
- Fixed all attributes related issues
- Fixed don't show selector in IA turn
- Fixed New attribute misspelled
- New icons for items combinations and window more intuitive
- Fixed removing empty item combination
- Removed add/remove button from attributes from formulas in character
- Added remove button to all the reorderable lists
- Can't remove attributes in character if they are defined in an asigned
specialized class