Add security scan status indicators in the plugins details page

[Xpirix]

Closes #267

Cc @Gustry

[timlinux]

This is a great idea. @Xpirix can you retrospectively run this on all plugins already on the system too?

[Xpirix]

This is a great idea. @Xpirix can you retrospectively run this on all plugins already on the system too?

Sure @timlinux , I have added a command that we can run on the server to run a security scan on the latest version of each plugin if a scan result does not already exist.

[timlinux]

LGTM thanks

[timlinux]

We need to surface the security check in the QGIS desktop plugin manager. We should be carefult that we do not create a false sense of security for the user, passing the checks does not imply the plugin is fully secure, just less less insecure.