[MediaPortal] Update GPL 2 file and FSF address

The Free Software Foundation's mailing address has changed.

Import a new copy of their GPL 2.0 file into the tree. LICENSE.txt is
now a verbatim copy of https://www.gnu.org/licenses/gpl-2.0.txt

Update the mailing address in each header.
[mythtv-cmyth] Update LGPL 2.1 file and FSF address

The Free Software Foundation's mailing address has changed.

Import a new copy of their LGPL 2.1 file into the tree. COPYING is now a
verbatim copy of https://www.gnu.org/licenses/lgpl-2.1.txt

Update the mailing address in each header.

(Note that a couple files in cmyth actually happen to be GPL, not LGPL.)
[argustv] update FSF address

The Free Software Foundation's mailing address has changed. Update the
mailing address in each header.
[pvr.demo] update FSF address

The Free Software Foundation's mailing address has changed. Update the
mailing address in each header.
[pvr.dvblink] update FSF address

The Free Software Foundation's mailing address has changed. Update the
mailing address in each header.
[dvbviewer] update FSF address

The Free Software Foundation's mailing address has changed. Update the
mailing address in each header.
[pvr.hts] update FSF address

The Free Software Foundation's mailing address has changed. Update the
mailing address in each header.
[iptvsimple] update FSF address

The Free Software Foundation's mailing address has changed. Update the
mailing address in each header.
[pvr.mythtv.cmyth] update FSF address

The Free Software Foundation's mailing address has changed. Update the
mailing address in each header.
[nextpvr] update FSF address

The Free Software Foundation's mailing address has changed. Update the
mailing address in each header.
[njoy] update FSF address

The Free Software Foundation's mailing address has changed. Update the
mailing address in each header.
vnsi: update FSF address

The Free Software Foundation's mailing address has changed. Update the
mailing address in each header.
[vuplus] update FSF address

The Free Software Foundation's mailing address has changed. Update the
mailing address in each header.
[pvr.wmc] update FSF address

The Free Software Foundation's mailing address has changed. Update the
mailing address in each header.
libhts: update FSF address

The Free Software Foundation's mailing address has changed. Update the
mailing address in each header.
platform: update FSF address

The Free Software Foundation's mailing address has changed. Update the
mailing address in each header.
tinyxml: update FSF address

The Free Software Foundation's mailing address has changed. Update the
mailing address in each header.