*: fix tab vs. space issues, and comments according to the guide.

Clean up all commented PORTREVISION and PORTEPOCH lines

No revision bump tool that we have cleans them up or deals with
them, so we end up with duplicated lines.  Instead of implementing
that just clean up the 51 ports that do this.

PORTREVISION and PORTEPOCH can be set to 0 explicitly instead if
you need a reminder or placeholder.

Remove # $FreeBSD$ from Makefiles.

comms/inspectrum: prepare for Qt5-5.15

Update to the latest commit as well (20191102)

Bump PORTREVISION for ports depending on the canonical version of GCC
as defined in Mk/bsd.default-versions.mk which has moved from GCC 8.3
to GCC 9.1 under most circumstances now after revision 507371.

This includes ports
 - with USE_GCC=yes or USE_GCC=any,
 - with USES=fortran,
 - using Mk/bsd.octave.mk which in turn features USES=fortran, and
 - with USES=compiler specifying openmp, nestedfct, c11, c++0x, c++11-lang,
   c++11-lib, c++14-lang, c++17-lang, or gcc-c++11-lib
plus, everything INDEX-11 shows with a dependency on lang/gcc9 now.

PR:		238330

Update to 2018.12.01

Fix Qt5 symbol version scripts to put the catch-all clause first.  When
a symbol matches multiple clauses the last one takes precedence.  If the
catch-all is last it captures everything.  In the case of Qt5 libraries
this caused all symbols to have a Qt_5 label while some should have
Qt_5_PRIVATE_API.  This only affects lld because GNU ld always gives the
catch-all lowest priority.

Older versions of Qt5Webengine exported some memory allocation symbols from
the bundled Chromium.  Version 5.9 stopped exporting these [1] but the
symbols were kept as weak wrappers for the standard allocation functions to
maintain binary compatibility. [2][3]  The problem is that the call to the
standard function in these weak wrappers is only resolved to the standard
function if there's a call to this standard function in other parts of
Qt5Webengine, because only then is there a non-weak symbol that takes
precedence over the weak one.  If there's no such non-weak symbol the call

This port requires USES=compiler:c++11-lang to build on GCC-based
architectures.

While here, pet portlint.

PR:		234344
Submitted by:	Piotr Kubaj
Approved by:	portmgr (tier-2 blanket)

Update MAINTAINER: use @FreeBSD.org

Update to g20180708.

Replace bsd.qt.mk by Uses/qt.mk and Uses/qt-dist.mk

From now on, ports that depend on Qt4 will have to set
	USES=		qt:4
	USE_QT=		foo bar
ports depending on Qt5 will use
	USES=		qt:5
	USE_QT=		foo bar

PR:		229225
Exp-run by:	antoine
Reviewed by:	mat
Approved by:	portmgr (antoine)
Differential Revision:	-https://reviews.freebsd.org/D15540

Fix dependencies.

Add inspectrum, a Offline radio signal analyser.