Step 1 of eliminating the "games" distribution: Move binaries to /usr/bin;

Step 1 of eliminating the "games" distribution: Move binaries to /usr/bin;
update paths; and include everything in the "base" distribution.

The "games" distribution being optional made sense when there were more
games and we had small disks; but the "games-like" games were moved into
the ports tree a dozen years ago and the remaining "utility-like" games
occupy less than 0.001% of my laptop's small hard drive.  Meanwhile every
new user is confronted by the question "do you want games installed" when
they they try to install FreeBSD.

The next steps will be:

2. Removing punch card (bcd, ppt), phase-of-moon (pom), clock (grdc), and
caesar cipher (caesar, rot13) utilities.  I intend to keep fortune, factor,
morse, number, primes, and random, since there is evidence that those are
still being used.

3. Merging src/games into src/usr.bin.

This change will not be MFCed.

Reviewed by:	jmg
Discussed at:	EuroBSDCon
Approved by:	gjb (release-affecting changes)