Context menu items for DockItemWithInput

[georgweiss]

Currently users can invoke the info dialog through a right-click on a DockItemWithInput tab title in order to find the underlying (file) resource. This is a bit clunky.

Suggest to add new items as shown in screen shot:

• Launch the File Browser app and highlight the resource
• Launch the native file browser in the resource's parent folder
• Copy resource path to clipboard

For http resources the "Open in..." item should maybe contain a sub-item like "In web browser".

Any thoughts?