Vb interactive #r support

Cleanup of ForegroundNotificationServiceTests

Add *.vc.opendb created by VC++ to .gitignore

Only build Release packages if we have no dependency on pre-release packages

Updates SRM to 1.2.0-rc2-23608 and DSR to 1.0.7-beta1

This fixes two possible test bugs (see #7512):

- The notification fired but fired just after the clock was sync'd to the time server (test bug - don't use DateTime.Now/UtcNow)
- The notification fired exactly on 50 milliseconds (test bug)

It also helps us figure out whether the test failed because:

- The notification wasn't fired after 50 milliseconds (product bug)
- The notification didn't fire (product bug)

Add `CopyCode` operation to InteractiveWindow

Do not wait for all members to be completed to emit a compilation event for the container.

Provide a faster implementation of Fuzzy Searching for 'Add Using'.

Since nothing from standard-input is copied.

Add correct checks for ref/out arguments in delegate constructors for compat mode