Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Upgrade to FICL version 3.02. Anything wrong is my fault, everything right is
due Jon Mini.

PR: 36308
Submitted by: Jon Mini <mini@haikugeek.com>
MFC after: 4 weeks

Bring in ficl 2.05.

This version has a step debugger, which now completely replaces the
old trace feature. Also, we moved all of the FreeBSD-specific MI
code to loader.c, reducing the diff between this and the official
FICL distribution.

Make abort" functional in interpret mode. This behavior is undefined
by ANS Forth standard, but it's useful.

Also, define the constant true in a more strict way. C might garantee
2-complement math, but Forth doesn't.

Bring in FICL 2.04. No bump of loader version is required by this
commit.

ANS Forth for logical not is 0=, not invert. Replace wrong usage.

Bring in ficl version 2.03. No version bump for loader.

Add conditional compilation facilities to ficl. This had been previously
committed to RELENG_3 instead of HEAD, so let's HEAD catch up.

PR: bin/9662

Add EXCEPTION word set.

Make TIB handling use buffer size to conform with ANS Forth.

Add ANS MEMORY-ALLOC word set.

See the PRs for extensive details.

PR: kern/9412 kern/9442 kern/9514
Submitted by: PRs from Daniel Sobral <dcs@newsguy.com>

Take init out of here - it's a layering violation.

Make fexists/fload work with existing string literals instead. Doing
my own string literal handling is just too wonky.

Remember a bit more of my forth and do:

o Add fexists word to check for the presence of a file
o make fexists and fload immediate words which DTRT both interpreted
and compiled (doh!)
o add an init word which gets run at bootstrapping time to do extra
post-coldload initialization (in the default implementation, we
look for /boot/boot.4th and load it if found).

Add the Ficl (Forth Inspired Command Language) interpreter. If all goes well,
this will allow us to manage bloat in the loader by using a bytecoded HLL
rather than lots of C code. It also offers an opportunity for vendors
or others with special applications to significantly customise the boot
process without having to commit to a divergent code branch.

This early commit is to allow others to experiment with the most effective
mechanisms for integrating FICL with the loader as it currently stands.

Ficl is distributed with the following license conditions:

"Ficl is freeware. Use it in any way that you like, with the understanding
that the code is not supported."

All source files contain authorship attributions.

Obtained from: John Sadler (john_sadler@alum.mit.edu)