Remove deprecated & outdated code; Autowire; Constructor Prop Promo

Fix status.

Expand scope of this issue to include code cleanup, removal of deprecated code and worked around code.

Include links to change notices in issue summary. Link to core issue.

New cleanup:

Argument lists for function declarations may be split across multiple lines →

Tests all pass.

Also done:
- Move ConfigHelper from Configuration to module root namesapce
- Move CasServerServiceInterface into module Entity namespace

Caches need to rebuilt before this will take. An update has been included in hopes this will take of it.

On 3.0.x branch.

Automatically closed - issue fixed for 2 weeks with no activity.