Help Integration

[cianoc]

One really nice thing that SuperCollider IDE has is really tight integration with helpfiles. At a minimum it should be possible to view and navigate the documentation from within the plugin.

[benswift]

This is really important - but the issue at the moment is the lack of reference/API docs. So it's hard to link to anything more specific than just the main docs page.

[benswift]

I've added an "Extempore Help" command in 9f16c77 (which just jumps to the main help page)