(mvc) more work on migrations, fix autoloader, serialize to config when all steps for this model are finished

(mvc) BaseModel add getVersion() to retrieve the running config version, commit changes to in memory config after every migration step.

Errors will be send to syslog, current policy is to always upgrade and ignore migration errors.
(there's not really a way back, other then undo pkg install and revert the full config)

(Base) Default to inf rows not 9999

(base) Do not encourage overriding getModel()

Overriding getModel() is not to be done lightly. The code relies on the same object being there through multiple calls to getModel(). Any overriding methods should preserve this same behavior. For this reason, we should not encourage tinkering with this in a comment, better be silent on the matter.

ApiMutableTableModelControllerBase

(base) Added hooks that can be used by controllers to take actions at the appropriate time during an action

Omit the console changes, we are not prepared for improving
the translation there.

PR: https://forum.opnsense.org/index.php?topic=3502