Move common directives and includes to a separate include file

Note that .386 needs to come before .MODEL, and is therefore not included in
ReC98.inc. Causes, um, weird label errors otherwise.
Replace the compatibility NOPs with a macro
[Reduction] #130: ___write

Doing one of these C monstrosities a day seems like a good habit. And hey,
ZUNSOFT.COM has already shrunk by over a third.
[Reduction] #131-134: graph_pi_load_pack

Second biggest master.lib object right there... and apparently, TASM doesn't
support segment prefixes in EQU directives?

And yes, there really is no viable solution for both the NOPCALL problem (the
TASM manual states that these NOPs are inserted during single-pass assembly,
which we can't do) and the complementary jump sequences (which are only
inserted for forward references when specifying the JUMPS directive, which
doesn't seem to work for us either).
[Reduction] #135: Superimposed pattern data

... It really shows that I forgot to compress the "db 0" statements in
2bd664c5e479250d55ae7aa109511a2206f941b0.