Builders: rm unnecessary and confusing base class
Builders: rm unnecessary and confusing base class

Senseg/robotframework,userzimmermann/robotframework-python3,Senseg/robotframework,Senseg/robotframework,userzimmermann/robotframework-python3,userzimmermann/robotframework-python3,userzimmermann/robotframework-python3,userzimmermann/robotframework-python3,Senseg/robotframework,Senseg/robotframework