Allows for the ".fill x-$" pattern.

When I zasm-ified the shell a couple of dozens of commits ago, I
inverted push and pops...

It was a bad idea to remove it. Now that I'm introducing the concept of
a per-app glue file, it becomes much easier to build emulated zasm as a
userspace app.

Let go of that "meta os" thing. it's not as meta as I made it sound
like. It's a kernel.

Made things complicated for nothing.

Make symRegister's logic pointer-based so we can break through the 0x100
limit.

But we're still at a certain distance from assembling it with zasm:
we're busting the 0x100 symbol limit.

Previously, we would mess up literals like '-'.

Also, make zasm assemble zasm/util.asm again!

To straighten out includes and to pave the way into zasm being part of
the same "include CFS" as parts, we make zasm includes namespaced.

This shrinks the CFS size to 21k from nearly 64K. This will allow me to
kick the can down the road a bit with regards to supporting storage
seek/tell greater than 64K.

I'll get to it, but first, I want to assemble zasm with zasm!

Simplifies comment stripping through sed.

Also, increase scratchpad size. It wasn't big enough for some
expressions in shell unit.

Couldn't get rid of instrUpcode though, too complicated.

We don't treat "," exactly as a whitespace anymore. We have specific
processing for it.