A Vector can now be converted to and from bytes of data.
I'm not entirely sure that the structure bytes do not have to
be handled for endianess, but the underlying basic types are
correctly handled.
Tests and and example have also be created. The tests lib file was split
into a converter test file and a transmutable test file.
There is now a ByteSized trait that can be used to specify how many
bytes it takes to represent a piece of data. This has been implemented
for all of the primitive number types. With this information Transmutable
was able to create a Vector2 wrapper that will need to be tested. If it
works then soon after Vectors and other Sigils types can be turned into
Transmutable types.
This also has the changes for the original tests and example
to use the new ByteSized information.
