Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

vt fontcvt: move to usr.bin/vtfontcvt

vtfontcvt is useful for end users to convert arbitrary bitmap fonts
for use by vt(4). It can also be used as a build tool, allowing us
to keep the source font data in the src tree rather than uuencoded
binaries.

Reviewed by: ray, wblock (D183)
Sponsored by: The FreeBSD Foundation

Update after r267011: use -h height and -w width args

Add VT(9) font tools.
Reviewed by: nwhitehorn
MFC_to_10_after: re approval

Sponsored by: The FreeBSD Foundation