Adding a delay such as the 20ms one we have in AVR programmer's
initialization routine is tricky without a word like TICKS.
This implementation is highly inaccurate, but more accurate and
reliable than a "ballpark" DO..LOOP...
The ":" now takes care of scanning for ";". Conceptually, having
";" as an immediate word is slightly simpler than the approach in
this commit, but when bootstrapping is involved, this simpler
approach gets murkier.
Moreover, it got even murkier-er when trying to de-stabilize EXIT,
so here we are.
This duplicated feature existed because of bootstrapping issues
with LIT", but again, with careful threading, we can clean things
up.
We can now have a proper "Collapse OS" prompt :)
