(pam) switch to pam, with the option to disable our pam helper and switch back to unix mode... for https://github.com/opnsense/core/issues/998

... and it may be that it never will...

(mvc) improve api errors for configuration issues (wrong/missing type) and remove unused return value

We have manifests for packages, no need to duplicate info
about sub-packages that aren't really packages.

Approved by: @adschellevis

PR: https://forum.opnsense.org/index.php?topic=3824

(hassync) trigger xmlrpc sync before service action, for https://github.com/opnsense/core/issues/1217

(mvc, migrations) remove the need for empty boilerplates by using BaseModelMigration when no custom migration is available for the current version.

(ipsec) remove ipsec_force_reload, replace with ipsec_configured_on_interface() to check if a tunnel is configured before reloading ipsec

(ipsec) remove failoverforcereload, when enabled it just calls ipsec_configure() twice, which doesn't look usefull

(mvc) some style fixes in ApiMutableModelControllerBase.php from https://github.com/opnsense/core/pull/1134

(ui) add modal form in legacy template to signal the user about pending service action (stop,start,restart)

(mvc) remove incomplete error handling, was superseded https://github.com/opnsense/core/commit/22701ee038722408a8d21916dbb6ee13023a39dd#diff-755c67cb284868a802a88a873c75038c closes https://github.com/opnsense/core/issues/1234

The current issue is you can't actually restart ipsec without disabling and enabling the service, which is odd and confusing.

Convert actions to configd template and change service registration.

Since plugins are now tied to the heartbeat of the system itself,
it makes sense to split out hardcoded base functionality into
their pluggable counterparts.  Start with the candidates that
already have a plugin file.

Discussed with: @adschellevis

fix broken squid configuration

(traffic shaper) add support for address lists, and invert src/dst. closes https://github.com/opnsense/core/issues/1226

(mvc, model) add support for lists of networks/addresses in NetworkField, requirement for https://github.com/opnsense/core/issues/1226