Add Snom UXMC D7C firmware entry

Hello,
This PR adds Snom UXMC D7C firmware entry, making it available through Wazo portal.
https://service.snom.com/display/wiki/D7C
https://service.snom.com/display/wiki/UXM+-+D7C+-+V1.1.1
It also updates the firmware_uxm option in the Snom plugin template, depending on what has been downloaded.
Finally, this PR updates Snom firmware links to HTTPS, as their HTTP links do not respond most of the time.
No issue with HTTPS.
Ref : Wazo ticket #5638.
Thank you 👍

Reviewed-by: Alexandre Fournier <None>
Reviewed-by: BnLG <None>

Gigaset N720 enhancements

Hi,
This PR brings some enhancements to Gigaset N720 :

It enables firmware updates. I found a trick to make the firmware link compliant with what N720 expects (it must end with the binary name), while keeping it served by Wazo itself. Look at the links for technical workaround, self explanatory :) Good news is that I'll be able to replicate this for N510 (see #142) 👍
It disables Gigaset.net info/news by default. Privacy is best.
It saves some characters on display name, characters are counted on these DECT screens...
It updates firmware to last version (tested, no issue with standard features).
It properly sets admin password.

Thank you 👍

Reviewed-by: Alexandre Fournier <None>

Yealink enhancements

Hello,
This PR brings several improvements to the Yealink plugin :

It properly adjusts account details display, with its name at the top of the screen, and its number in front of the DSS key.
It enlarges DSS key label zones, so that we can display larger labels.
It brings a bigger DND logo, so that we easily know DND has been left on.
It enables SRTP, if transport is TLS.

Thank you 👍
Before :

After :

Reviewed-by: Alexandre Fournier <None>

Snom enhancements

Hello,
This PR brings several improvements to the Yealink plugin :

It properly adjusts account details display, replacing useless SIP user ID with the extension number.
It disable local phonebook if remote phonebook is available (so that we're sure it's properly used).
It adjusts retry_after_failed_register, making devices to retry faster on their first retries, as some SIP-TLS configured devices systematically wait 2 minutes before registering. Adjusting retry_after_failed_register like in this PR solves this issue.
It ajusts provisioning_order, allowing to provision Snom devices manually. This modification does not break DHCP provisionning, it simply allows devices to provision manually if they do not receive any provisioning option from DHCP.
It enables SIP-TLS and SRTP on a per-line basis.

Thank you 👍
Before :

After :

Reviewed-by: Alexandre Fournier <None>

Gigaset N510 enhancements

Hello,
This PR enhances Gigaset N510 plugin.
First, it enables firmware auto-update, thanks to properly formatted links provided by Gigaset.
As found in the documentation :
https://teamwork.gigaset.com/gigawiki/display/GPPPO/Direct+link+to+Firmware+file
While here, also update to last firmware version.
https://teamwork.gigaset.com/gigawiki/display/GPPPO/Firmware+N510+IP+PRO
It also properly assign each DECT to its SIP line only.
By default, on N510, all DECT ring / receive calls for all the 6 configured SIP accounts.
And all DECT make outgoing calls from the first configured SIP account.
Which does not make sense...
This PR then properly assign each DECT to its proper SIP account : first DECT to first SIP account, second DECT to second SIP account etc..
Which is then the expected behaviour...
Thank you 👍

Reviewed-by: Alexandre Fournier <None>

Add Mitel 69xx in version 5.1.0

Reviewed-by: Alexandre Fournier <None>

WAZO-2562 - Disable G722 variation for T58 and T58W

Reviewed-by: Alexandre Fournier <None>