WIP: ServiceManager and EventManager v2-v3 compatibility

Updated dependencies to stable, forwards-compatible versions. Additionally,
removed zend-di and zend-mvc from the mix, as this version contained a test for
a class in zend-mvc (wrong component!).

zend-captcha and zend-session are removed when testing against v3
components as they are not yet forwards-compatible; tests against them are
marked skipped when that occurs.

Added an env variable for specifying the hydrator version to use, and now vary
the stdlib version based on the hydrator version, ensuring v2 variants are used
consistently (with v1.1 of hydrator).

Updated all `triggerUntil` calls to use the `triggerEventUntil` syntax,
to ensure both BC and FC (`triggerUntil()` in v2 uses the old signature,
making it non-viable for code supporting both versions).

This patch updates the FormElementManager and HelperConfig to ensure backwards
compatibility with v2. In addition, it removes code made obsolete by the final
zend-servicemanager v3 version (specifically, auto invokables were
re-introduced, and creation options are now present for classes mapped to the
`InvokableFactory`).