nuke a few missed -Ifactiondir CPPFLAGSitions.

Add a COMMENT describing what each component roughly does.

"make describe" prints the comment.

Requested/inspired by Vincent Schwarzer on rumpkernel-users

tty support is finally a standalone component

Rename IOCONFIG to IOCONF. It matches the config(1) keyword and
aligns better in Makefiles.

add u3g

Globally define -Wno-pointer-sign, as it has become a pointless
exercise of "add it to every Makefile individually".

XXX: should autosynchronize with the rest of the kernel buildflags
in sys/conf/Ma

Globally define -Wno-pointer-sign, as it has become a pointless
exercise of "add it to every Makefile individually".

XXX: should autosynchronize with the rest of the kernel buildflags
in sys/conf/Makefile.kern.inc.

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Move a bunch of rump components from dev/wip to dev/lib now that
they've reached a certain maturity.