VM side of the work needed for #58. Tests are still only 4-component,
but the geometric algebra tests seem to have 2-component covered at
least a little bit.
While it could be emulated using a 3d cross-product, it was a hack and
required the use of a swizzle (or alias) to extract the scalar value.
This will make 2d PGA a little nicer when I get to modifying qfcc for it
It calculating only the size of the array (which was often 4 or 8
globals per element) proved to be a pain when I forgot to alter the size
for the new scale tests. Fixing the size calculation even found a bug in
the shiftop tests.
While working on the new opcode table, I decided a lot of the names were
not to my liking. Part of the problem was the earlier clash with the
v6p opcode names, but that has been resolved via the v6p tag.
