Implement version checking of native code library

[David Williams]

With multiple platforms soon being supported we may run into issues of the different native code libraries being out of sync with each other. The C# scripts should check the version number before using the libraries so they can alert the user to a problem.

[Matt Williams]

I see we have cuGetVersionNumber() which I guess we will use for this. It then becomes a case of making sure we update the numbers in there. We probably only need to do it at each release rather than every time we make a change.

[David Williams]

Exactly, this is what I'll use. I'll call it from Unity and make sure it matches the expected version. This way we can give a meaningful error to the user and tell them what to do about it.

[David Williams]

This has been implemented.