CMS-1774 Convert mixin_get to use value objects

Model classes used by both ContentType and Mixin
CMS-1774 Convert mixin_get to use value objects

Fixes to frontend remote model
CMS-1774 Convert mixin_get to use value objects
CMS-1773 Convert mixin_list to use value objects
CMS-1776 Convert mixin_create (mixin_createOrUpdate) to use value objects
CMS-1777 Convert mixin_update (mixin_createOrUpdate) to use value objects
CMS-1775 Convert mixin_delete to use value objects
CMS-1934 Global event CloseWizardPanelEvent should not be needed - replace with other solution
Removed global CloseWizardPanelEvent
Introduced Closeable interface and made WizardPanel closeable.
Made close actions call close on wizardPanel
Moved specific implementation of askUserForSaveChangesBeforeClosing() to WizardPanel, since now SaveBeforeCloseDialog is in the api too.
CMS-1772 Convert schema_tree to use value objects

and

CMS-1771 Convert schema_list to use value objects

Converted schema_list and schema_tree to JAX-RS services.
Added tests for them, but they should be finished when style
of asserting of JSON will be decided
Changed to use tomcat (instead of jetty) for runner.
CMS-1918 Fixes for BrowseFilterPanel
CMS-1936 TabMenuItem.removeButton does not look nice
Merge pull request #317 from enonic/CMS-1772

CMS-1772 Convert schema_tree to use value objects
revert ts fixes

revert ts fixes
CMS-1917 Upload icon tooltip is misplaced in Schema Manager Wizard.
CMS-1939 Add support for mnemonic in Action
Renamed AbstractButton to ActionButton.
Created Button as a plain button (used by ActionMenu).
Created Mnemonic and made Action support it.
Used mnemonic for action buttons in SaveBeforeCloseDialog.
Merge pull request #315 from enonic/CMS-1931

CMS-1931 Refactor DisplayNameChangedEvent and NameChangedEvent to be "lo...
CMS-1935 Make MixinWizardPanel.saveChanges work

Put MixinWizardPanel.persistNewItem and updatePersistedItem into action!
Merge pull request #318 from enonic/CMS-1935

CMS-1935 Make MixinWizardPanel.saveChanges work
CMS-1918 Fixes for BrowseFilterPanel

- refactored all filter inner classes