I'm planning on de-hardcoding columns in VE a bit to add support
for screens narrower than 67 columns. There's a lot of hardcoding.

Let's begin with not using core's LIST anymore. This allows us to
spit 1-16 numbers only at startup.

The few extra bytes they save in the core aren't worth the extra
complexity. This was initially done in a context where I had
troubles keeping the RC2014 binary with SDC inside the 8K limit.

At this point, even with the few extra bytes we add here, we're at
7200 bytes, so I'd say we're fine.

Shadowing core "I" is too messy. As soon as ed is loaded in memory,
nothing else that isn't "i-aware" can be loaded anymore.

I guess that's why "contexts" exist in Starting Forth, but adding
this concept just for allowing the shadowing of core words seems
overkill to me. Renaming I to i in ed seems better.

This was becoming heavy to manage.

Written from VE!

This gives us backspace handling. Also, remove all usages of C<
which allows us to remove the C<* override.

This is the first commit I do entirely in VE. It's a habit I'm planning
on taking as it helps a lot to find usability issues.

It simplifies things. Also, removed ';' which became useless.

This fixes weird glitches I had on trs80. It's *always* a matter of
RAM initialization. By now, I should know...

Kinda proud of this one. Efficiently piggy-backing on the Block
Editor, keeping things simple, and yet, building power into the
editor.

Which are end-of-word movements.

Also, add insert and find buffers to the header, making it 3 lines
high.

Also, fix the "I" overshadowing word which wasn't operating on the
proper RSP level.

Also, fix I which didn't mark the block as dirty.

Now that the boot binary is fully cross-compiled, there's no use for
the linker anymore. Theoretically, it could still be useful, but I
can't think of a real use case.

Let's take it out of the picture. If it's ever needed again, I'll
know where to find it.

There was a weird empty block in the middle of the program.