Add Plank Preferences to the Dock tab in the Desktop Section

Registered by Troy Wolters

Running `plank --preferences` at a command line opens a window to configure Plank. This is preferable over telling users to modify the dotfiles for plank.

There should either be a button in the Dock section of switchboard that opens this preferences window, or the controls found in the preferences window should be programmed right into the Dock section instead. The first option is less work and takes into account changes made to Plank in the future.

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Troy Wolters
Direction:
Needs approval
Assignee:
None
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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