Refactor code for PYT-553

[fdrozdowski]

Refactor classes in __common__classes.py to be consistent with __plugin__classes.py

┆Issue is synchronized with this Jira Bug by Unito

[fdrozdowski]

➤ Aleksandr Liber commented:

This will be good to get in asap as having the defaults for these classes creates potential for a number of toolkit developer errors.