* Introduced MWLinkAction which opens the right link inspector
based on what is selected.
* Added MWLinkInspectorTool overriding core's 'link' tool that
executes MWLinkAction
* Removed MWLinkNodeInspectorTool and linkNode command,
they're unneeded now
Bug: 72150
Change-Id: I03bd6ab1f67f31a6e6cb717cf4298e80e64637b7