Update to new plugin architecture

[craigmdennis]

This is listed as a legacy plugin and will be deprecated.

[Gorkiy]

Hi, any chance to run plugin on Sketch latest versions? I can't even see this in plugin's menu on Sketch. I am a big fan of your plugins!
Thanks

[rohanbhangui]

@craigmdennis @Gorkiy I updated one of the plugins, thought I'd share. I am sure the others could be similarly tuned. #5