New features for the docker plugin

[subzero79]

• Add basic macvlan support, you can choose from existing macvlan networks. Macvlan networks still need to be managed by cli
• Add clear log button.
• Add full restart policy options
• Fix incorrect variable parsing from images (plexmediaserver url issuehttps://forum.openmediavault.org/index.php/Thread/18655-Docker-GUI-Failure-to-fully-enumerate-Environment-Variable/
• The modify/copy container now retains the extra arguments fields. This only works from this version onwards. Existing containers won't be able to be modified/copied and retain those extra options