Minor bug fixes after migration to new script class template.
Now script can be easily added imported an used in scenario script files.

Added background slider to visualize part size in perspective of its min and max size range.
Values are still modified only as text and not with slider - this is by design because this way user will have full control of precision.

* Added auto update of field values (presented dimension sizes) in case of manual part change. Previously you were required to change focus to force update.
* Implemented visibility of only supported dimensions (example: round parts only support two). Previously you had a chance to try and modify non existing dimensions.
* Implemented field locking so that only changeable dimensions could be edited.