EventDisplaysOnline: use auto-declaring interface and ServiceHandle

Code migration.

This merge request affects 1 package:

• graphics/EventDisplaysOnline

This merge request affects 3 files:

• graphics/EventDisplaysOnline/EventDisplaysOnline/IOnlineEventDisplaysSvc.h
• graphics/EventDisplaysOnline/EventDisplaysOnline/OnlineEventDisplaysSvc.h
• graphics/EventDisplaysOnline/src/OnlineEventDisplaysSvc.cxx

Adding @rbianchi as watcher

added EventDisplay main review-pending-level-1 labels

CI Result SUCCESS (hash acdcf00f)

	Athena
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
For experts only: Jenkins output (remote access info)

Changes looks fine, approving from L1

removed review-pending-level-1 label

added review-approved label

merged

mentioned in commit c275e681