Revert "Issue #1331486 by katbailey, chx, sun, beejeebus, amateescu: Move module_invoke_*() and friends to an Extensions class. Broke core tests after commit."

This reverts commit c80c3e18.

Issue #1331486 by katbailey, chx, sun, beejeebus, amateescu: Move module_invoke_*() and friends to an Extensions class.

Issue #1855204 by g.oechsler, effulgentsia: Fixed RouteBuilder needs to respect route options set in yaml file.

Issue #1801570 by effulgentsia, klausi, Crell, disasm: DX: Replace hook_route_info() with YAML files and RouteBuildEvent.

Revert "Issue #1801570 by effulgentsia, klausi, Crell: DX: Replace hook_route_info() with YAML files and RouteBuildEvent. This unintentionally broke REST module tests."

This reverts commit 7bf7eb83.

Issue #1801570 by effulgentsia, klausi, Crell: DX: Replace hook_route_info() with YAML files and RouteBuildEvent.