Gigaset, add support for N670 IP PRO

Hi,
Let's add support for the new Gigaset N670 IP PRO (and also for the Gigaset N870E IP PRO), which shares exactly the same configuration as the already existing N870 IP PRO.
Let's then create a Nx70 IP PRO plugin (which is how Gigaset names them).
First commit is then a 1:1 copy of N870-83.v2.48.0 plugin.
Next commits are modifications, explained below.
It add support for N670 IP PRO and  N870E IP PRO.
It updates firmware to last 83.v2.49.1 version.
It enables SIP TLS (kept disabled in #147), which now properly works (SipProvider.0.UseSIPS must be set to 0, after support from Gigaset team).
It properly sets ToneScheme according to configured locale.
It deregisters accounts for detached handsets (WithDeregOnHsNotReachable), which makes more sense than the contrary.
Finally, it renames the keys to the ones defined in the README.
Thank you 👍
Note that this is a rework of #159, after the move to Python3.

Reviewed-by: Alexandre Fournier <None>

yealink remote controll

Supersedes #143

Reviewed-by: Jesse Sopel <None>

definition

Yealink T33(P/G) correction of the number of usable keys defined by t…

…he manufacturer

Reviewed-by: Alexandre Fournier <None>

gigaset: fix python3 decode error

Reviewed-by: Alexandre Fournier <None>

Switch from HTTP to HTTPS on all SNOM plugins

Reviewed-by: Jesse Sopel <None>

Disable Video Codec for Yealink T58 and T58W

Reviewed-by: Alexandre Fournier <None>

cisco-spa-7.5.5: fix bytes and str concat

Reviewed-by: None <None>

add expansion module

add new expansion keys for new devices

Reviewed-by: Alexandre Fournier <None>
Reviewed-by: Franck M <None>

Wazo 2910 - python3 plugins

Depends-On: wazo-platform/wazo-provd#55
Note: This should not be merged until we are ready to release the new repo

Reviewed-by: Alexandre Fournier <None>

for tests

cannot run on older stacks