Implement new plugin command

[bernd]

There should be a command that runs through the following steps to create a new Graylog plugin.

• Create a new plugin directory by using the maven archetype
• Put the new plugin directory into the graylog-project-repositories path
• Create a new manifest for the plugin that includes the server

[mautematico]

Absolutetly!

If you point me on the right direction, I'll be glad to help.

[kiview]

Is there any documentation for the current manual workaround?

[kroepke]

The old documentation is at http://docs.graylog.org/en/2.4/pages/plugins.html#creating-a-plugin-skeleton

It is possibly outdated and should be improved based on this improvement.

[jalogisch]

I just have updated the docs to the project cli -

https://docs.graylog.org/en/3.3/pages/plugins.html#creating-a-plugin-skeleton