..utility.pvmanager: creating pvmanager service extension point

Change-Id: I9881b802088154b4103d0153f6c062905dec6f4c
Signed-off-by: Kunal Shroff <shroffk@bnl.gov>
..pvmanager.services: using the extension points to register services

Change-Id: Icf4da8bbcef637ff3d6cdb5fc470c682924defb2
Signed-off-by: Kunal Shroff <shroffk@bnl.gov>
..pvmanager.services: fixing the name

Change-Id: I762517d7a67a5aff9a3accce10651bd75a13a1a8
Signed-off-by: Kunal Shroff <shroffk@bnl.gov>
..pvmanager.services: adding a management view for the registered
services.

Change-Id: I78a496ab5bd3a0ce555e65dec046f97de1b4ae61
Signed-off-by: Kunal Shroff <shroffk@bnl.gov>
Merge branch '3.2.x' of ssh://git@github.com/ControlSystemStudio/cs-studio.git into 3.2.x