Much faster!

All recipe makesfiles would previously assume a built emul/.

Fixes #113

Now that adev is directly in core, things are easier.

It's now much easier...

Finally got rid of the XPACKed core and managed to cross-compile
all core words, which greatly simplifies the bootstrapping process.

Makes xcomp.fs units shorter.

TODO: implement X['] so that I can remove those XCURRENT patterns.

Now more low/high layers.

This leaves space for xcomp-core which is growing.

This allows us to move words like ABORT" to xcomp-core, which is
I think the last roadblock before being able to unify all drivers
into a single xcomp layer.

Now I struggle to remember why I ever did things they way I did.
There must have been a reason...

The goal is to insert device drivers in between.

I'd like to move this code, along with all recipe contents, to blk/.
It's easier if "emul-related" code is gathered at the same place.

With all this recent movements, we had a bit of a fragmentation
issue.

Not worth the complexity and space.

I'm reserving the 100-200 range for non-bootstrapping needs.

I have yet to test the whole process on real hardware. Soon.

This completes the migration of all Collapse OS code into blkfs!

And adjust rc2014/eeprom recipe

XPACK is more efficient than stripfc was, we can pack more stuff in 8K.
We now have enough space to fit readln.

Big bootstrapping change which greatly reduces the role of the modern
operating system in the bootstrapping process.

Less noisy this way

That becomes irrelevant in Forth

The way is clear for complete stage1 bootstrapping on the RC2014
target!

We can get rid of acia.z80, but not of acia.fs yet, we still need it.

It doesn't serve much purpose and takes up many precious bytes. And,
after all, parsed didn't do it either...

It didn't have z80a anymore.