Expose the rest of the Driver API

[bheisler]

RustaCUDA currently exposes only a minimum-viable subset of the Driver API. Ultimately, it should expose all non-deprecated public functions in the API.

This is a tracking issue to keep track of which aspects of the API should be available but aren't. If you need something that isn't listed here, add a comment and raise an issue.

• Events: #6
• Primary Context Management: #7
• Asynchronous memcpy: #8
• JIT Linking: #9
• Multi-dimensional arrays: #10
• Texture/surface objects: #11
• Expose the rest of the Unified memory management API: #12
• Stream callbacks: #13

There are more features to add (including features only added after CUDA 8.0) but this should be enough for now.

[phdoerfler]

@bheisler I'm still fairly new to CUDA so please excuse me if this makes little sense: I'd love to see support for using tensor cores in RustaCUDA. My current project requires shared memory (which I believe RustaCUDA supports?) and tensor cores for which I found no sign that they are supported. If I can use those with RustaCUDA I'll switch in a heartbeat.