CMS-4307 Page Templates - Design fixes to Module selector input

- added RichComboBox.getSelectedOptions() and removed it from inheritors
- fixed spelling in SelectedOptionsView.getSelecteOptions
- created interface SelectedOptionView and BaseSelectedOptionView realisation
- renamed ModuleConfig to ModuleView and removed combobox from there
- created ModuleConfiguratorComboBox and used ModuleView as SelectedOptionView there
- finally changed ModuleConfigurator from InputTypeNotManagingAdd to InputTypeManagingAdd
Merge pull request #1032 from enonic/cms-4307

CMS-4307 Page Templates - Design fixes to Module selector input