Remove WWW entries moved into port Makefiles

Commit b7f05445c00f has added WWW entries to port Makefiles based on
WWW: lines in pkg-descr files.

This commit removes the WWW: lines of moved-over URLs from these
pkg-descr files.

Approved by:		portmgr (tcberner)

Add WWW entries to port Makefiles

It has been common practice to have one or more URLs at the end of the
ports' pkg-descr files, one per line and prefixed with "WWW:". These
URLs should point at a project website or other relevant resources.

Access to these URLs required processing of the pkg-descr files, and
they have often become stale over time. If more than one such URL was
present in a pkg-descr file, only the first one was tarnsfered into
the port INDEX, but for many ports only the last line did contain the
port specific URL to further information.

There have been several proposals to make a project URL available as
a macro in the ports' Makefiles, over time.

One more small cleanup, forgotten yesterday.
Reported by:	lwhsu

Remove # $FreeBSD$ from Makefiles.

- Fix shebangs

Cleanup $() variables in ports Makefiles.

Mostly replace with ${}, but sometime, replace with $$() because it is
what was intended in the first place. (I think.)

Sponsored by:	Absolight

- Remove PORTSDIR from depends

Approved by:	portmgr blanket

Improve shebangfix framework

- Support multiple values in *_OLD_CMD, i.e. we can now fix both
"/usr/bin/python" and "/usr/bin/env python" at the same time
- Default *_OLD_CMD values are now always appended, so you don't need to specify
them in individual ports
- Add lua support (depends on USES=lua)
- Add more default values, such as "/usr/bin/env foo" for python, perl, bash,
ruby and lua
- Shebangfix now matches whole words, e.g. we will no longer (erroneously)
replace "/usr/bin/perl5.005" with "${perl_CMD}5.005" (but "/usr/bin/perl -tt" is
still (correctly) replaced with "${perl_CMD} -tt")

Note that *_OLD_CMD items containing spaces must now be quoted (e.g.
perl_OLD_CMD=/bin/perl /usr/bin/perl "/usr/bin/env perl")

Update shebangfix usage according to new rules in many ports:

- Remove *_OLD_CMD for patterns now replaced by default
- Quote custom *_OLD_CMD which contain spaces

Fix shebangfix usage in many ports (irrelevant to infrastructure change):

- Remove redundant SHEBANG_LANG (no need to duplicate default langs)
- Remove redundant *_CMD (such as
python_CMD=${LOCALBASE}/bin/python${PYTHON_VER} when USES=python is present)
- Never use *_OLD_CMD in REINPLACE_CMD matchers, these should always look for
exact string

Approved by:	portmgr (bapt)
Differential Revision:	D3756

Update ports in the remaining categories to not use GH_COMMIT.

With minor cleanups to make things simpler.

With hat:	portmgr
Sponsored by:	Absolight

New port: sd-agent

Server Density Agent for FreeBSD

Monitor CPU, memory, disk usage, network, Apache, MySQL + more via the
ServerDensity platform.

WWW: https://www.serverdensity.com/