New 'u-blox' plugin (v3)

[Dan Williams]

On Wed, 2016-10-12 at 13:49 +0200, Aleksander Morgado wrote:
> Hey Dan & everyone,
> 
> This is the 3rd update on the 'aleksander/ublox' branch, with this
> additional changes done after Dan's last review:
> 
>  * Recovered the original DENIED registration state logic.
>  * Implemented a generic +CFUN parser and then included
> plugin-specific parsers for the ublox, linktop and mbm plugins,
> including unit tests.
>  * Fixed the +UPINCNT patches which had some code squashed in the
> wrong commit.
>  * Fixed RSRQ logic in +CESQ parser.
>  * Updated +UBANDSEL parser to use g_strchomp() to get rid of
> trailing
> whitespaces, including CR and LF.
> 
> Reviews of the implementation are more than welcome.
> https://cgit.freedesktop.org/ModemManager/ModemManager/log/?h=aleksan
> der/ublox

Changes look good to me!

Dan