Include the specified version range from plugin import when looking for
a matching plugin.

Effects:
* unsatisfied version constraint causes ImportObject to be unresolved
  -> error overlay, no navigation available
* double click in manifest editor navigates to a matching version, not
  the latest

Change-Id: I4e3d082ac1176200771746a3e35d747ccba02e9f
Signed-off-by: Julian Honnen <julian.honnen@vector.com>