CMS-3133 Input Type Textline - Adjustments when used in "multiple" mode

Updated `remove` icon: it will be the same size, as in combobox
elements.
Reduced space between `Add` button and input elements in multiple mode.
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
Merge pull request #638 from enonic/CMS-3133

CMS-3133 Input Type Textline - Adjustments when used in "multiple" mode
Merge branch 'master' into CMS-3194

Conflicts:
	modules/wem-webapp/src/main/webapp/admin/common/js/ui/selector/DropdownGrid.ts
	modules/wem-webapp/src/main/webapp/admin/common/js/ui/selector/_module.ts
	modules/wem-webapp/src/main/webapp/admin/common/js/ui/selector/combobox/ComboBox.ts