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Rewrite of the architecture to accomodate on-view parameters and to enable code reuse
between the default widget and custom widgets.
* Remove private unused field 'sketchView'
* Mark constructor with single argument as explicit
* Mark virtual methods of base class as override
* Fix clang code model parsing error
* Avoid too short identifiers
* Avoid redundant ternary operators
* Avoid passing Base::Unit by value but by const reference
