Handle restrict_scope correctly

[TopperDEL]

Expected Behavior

The SWIG-Proxy should handle the restrict_scope-function correctly.

Actual Behavior

I could not wrap EncryptionRestrictions correctly with SWIG, so I had to add the file "restrict_scope_helper.go" to overcome this issue.

Help wanted

I did not get SWIG to handle this correctly, but I'm pretty sure that it is possible. Any help is greatly appreciated!

[TopperDEL]

This one is still not optimal. With Uplink-c the names changed to "access_share" instead of "restrict_scope" - but the Problem is the same.

I did not manage to get SWIG to generate a good Proxy for this signature:
https://github.com/storj/uplink-c/blob/8a57b27665f7e5f24feeb3c30d157ff6b7e45ae3/access.go#L98

The prefixes-argument gets converted to one single SharePrefix, but is meant as a pointer to the first element of an Array.

Help appreciated!