Move to nautobot base templates

[scetron]

This adopts the newer Nautobot base templates and fixes other minor issues with templates.

Fixes #196 and #177

[itdependsnetworks]

I think you need to bump this as well https://github.com/nautobot/nautobot-plugin-circuit-maintenance/blob/develop/nautobot_circuit_maintenance/__init__.py#L86

[chadell]

are these new templates available in all the Nautobot versions we support in the plugin? I mean, I know we make Nautobot Core backwards compatible, but maybe the new templates were not available before, so the plugin won't work in older versions of Nautobot.
I know there was a conversation about this few days ago. For instance, in Golden Config, there is a table of the minimum supported Nautobot version for the plugin version. Maybe we should do something like this here, instead of trying to keep full backwards compatibility in the plugin (keeping both templates versions, for instance)

[itdependsnetworks]

What we came to the conclusion on GC was. Let's not restrict (below a Nautobot 2.0) but let's be aggressive in bumping versions to not support older versions of Nautobot. This allows us to not have to worry about backwards compatibility and by logical sense, anything that breaks with the legacy versions is a Nautobot Core concern. Documented the approach here: https://github.com/nautobot/nautobot-plugin-golden-config/blob/develop/docs/admin/admin_install.md#deprecation-policy

[scetron]

I agree about following the model of Golden Config, I think it would be quite difficult to keep up with the feature velocity of Nautobot in our plugins if we had to make sure there was extensive backward compatibility.

[chadell]

Yes, I also agree that creating a well documented deprecation policy could grant us an easier development moving forward.
So, why not start on this PR? Plugin >=0.6.0 only supports Nautobot 1.4.0

[jvanderaa]

@chadell should we get this implemented before the 1.0.0? And possibly look to add nautobot.utilities.filters.MultiValueDateTimeFilter to the search?

[chadell]

Isn't most of it covered by 0f4a3a2 ?

For support nautobot.utilities.filters.MultiValueDateTimeFilter, we can tackle it as an improvement for a future minor release.

[jvanderaa]

Looks like we have a lot out of date now @scetron