Remove logging
CMS-3046 Create new UI component: api.ui.selector.dropdown.Dropdown
Introduced api.ui.Viewer - an abstract class for viewing an object
CMS-3046 Create new UI component: api.ui.selector.dropdown.Dropdown
Created needed API for deleting a page
CMS-3046 Create new UI component: api.ui.selector.dropdown.Dropdown
Created PageTemplateSummaryViewer.
Created DeletePageRequest.
Created interface PageCUDRequest and made CreatePageRequest, UpdatePageRequest and DeletePageRequest implement it.
CMS-3046 Create new UI component: api.ui.selector.dropdown.Dropdown
Introduced Dropdown

DropdownGrid, ComboBox and RichComboBox are now supporting a Viewer to display Option.displayValue
Introduced ContentSummaryViewer
ContentComboBox: Used new ContentSummaryViewer instead of optionFormatter-function.
ImageSelector: Used new ContentSummaryViewer instead of optionFormatter-function.

Moved ComboBox.moveFocuseToNextInput to FormEl so it can be resued.

ContentWizard:
- Page is now never created when creating new Content,
instead it's created when user have selected a PageTemplate.
- If user chooses auto in PageTemplateSelector, then Page is removed from Content