Aleksander Morgado e7a6bb7504 data,fcc-unlock: add example unlock scripts
Added scripts for Foxconn SDX55, Quectel EM120, and several old Sierra
Wireless manufactured devices:
 * Installed but not used by default, the user needs to setup manual
   links from ${pkgdatadir}/fcc-unlock.available.d, to
   ${pkgsysconfdir}/fcc-unlock.d in order to enable them.
 * Installed with rights only for the owner, so that the dispatcher in
   ModemManager can validate them.
 * They rely on $PATH to find the qmicli/mbimcli tools.

In addition to these scripts, per-vid:pid links are created in the
same ${pkgdatadir}/fcc-unlock.available.d directory, specifying which
are the specific devices that require the FCC unlock operation.

This patch also creates the ${pkgsysconfdir}/fcc-unlock.d and
${pkglibdir}/fcc-unlock.d directories where ModemManager looks for the
enabled tools.

Note that the meson setup doesn't support creating/deleting links
officially yet, so we use a workaround using meson.add_install_script
that is not perfect (i.e. doesn't handle the symlink removal during
uninstall). See https://github.com/mesonbuild/meson/issues/1602
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ModemManager.
ModemManager provides a unified high level API for communicating with mobile
broadband modems, regardless of the protocol used to communicate with the
actual device (Generic AT, vendor-specific AT, QCDM, QMI, MBIM...).

Using.
ModemManager is a system daemon and is not meant to be used directly from
the command line. However, since it provides a DBus API, it is possible to use
'dbus-send' commands or the new 'mmcli' command line interface to control it
from the terminal. The devices are queried from udev and automatically updated
based on hardware events, although a manual re-scan can also be requested to
look for RS232 modems.

Implementation.
ModemManager is a DBus system bus activated service (meaning it's started
automatically when a request arrives). It is written in C, using glib and gio.
Several GInterfaces specify different features that the modems support,
including the generic MMIfaceModem3gpp and MMIfaceModemCdma which provide basic
operations for 3GPP (GSM, UMTS, LTE) or CDMA (CDMA1x, EV-DO) modems. If a given
feature is not available in the modem, the specific interface will not be
exported in DBus.

Plugins.
Plugins are loaded on startup, and must implement the MMPlugin interface. It
consists of a couple of methods which tell the daemon whether the plugin
supports a port and to create custom MMBroadbandModem implementations. It most
likely makes sense to derive custom modem implementations from one of the
generic classes and just add (or override) operations which are not standard.
There are multiple fully working plugins in the plugins/ directory that can be
used as an example for writing new plugins. Writing new plugins is highly
encouraged! The plugin API is open for changes, so if you're writing a plugin
and need to add or change some public method, feel free to suggest it!

License.
The ModemManager and mmcli binaries are both GPLv2+.
The libmm-glib library is LGPLv2+.

Code of Conduct.
Please note that this project is released with a Contributor Code of Conduct.
By participating in this project you agree to abide by its terms, which you can
find in the following link:
  https://www.freedesktop.org/wiki/CodeOfConduct
CoC issues may be raised to the project maintainers at the following address:
  modemmanager-devel-owner@lists.freedesktop.org
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