Nyall Dawson 408da45877 [needs-docs] Place core plugin actions into top level menus
when plugin only has a single action

Affected actions:
- Database -> DB Manager -> DB Manager
- Coordinate Capture -> Coordinate Capture
- Vector -> Geometry Tools -> Geometry Checker
- Raster -> Georeferencer -> Georeferencer
- Vector -> Topology Checker -> Topology Checker

These are now just top level actions, e.g.
- Database -> DB Manager
2018-05-16 14:08:43 +10:00
..
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2018-05-08 09:33:07 +10:00
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