Separate memblock and vector functionality

[JarrettBillingsley]

The more I think about it, the more sense it makes to keep memblocks as a basic blob of bytes. Having to check that memblocks are of the appropriate type is awkward and annoying. Really, the vector functionality (treating them as mathematical vectors of numbers) should be moved into a separate object using a memblock to back it, much like StringBuffer uses a memblock as its backing data store.

[JarrettBillingsley]

Closed in 4b4f71f