Remove selection constructor

Selection is not needed.
Split generatorSenderPage wizard to two separate pages
Introduce superclass for wizard pages
Launch generator wizard as properties request
Add controls to Generator page
Extend generatorPage controls
Create updateSelectionAdapter

* Refactor GeneratorPage
Add generator edit commands

Except properties
Add command for changing generator run object
Create command on generator wizard close
Execute command on generator properties change
Disable finish button when run type is not selected
Show current values in generator properties dialog