Fix #6441.

Add check for the line number to be positive.
Check for valid codeSnippet.
Fixes #6531 so that folder-based overrides work correctly.

This change queues up messages from Scopes as they are being added and
sends them out once they are fully added.
Updated by ALF automation.
Merge pull request #6533 from adobe/alf_localization

ALF Automation
Merge pull request #6532 from adobe/dangoor/6531-folder-overrides

Fixes #6531 so that folder-based overrides work correctly.
Do not set display line number for invalid lines
Merge pull request #6442 from busykai/fix-6441

Fix #6441.