nway_conference == true was evaluating as true regardless if nway_conference was set to true or false, just as long as it had a value of any kind.
This also fixes it so that you can set nway_conference to false in the default settings and it will disable the network conference feature, previously once it was enabled on yealink phones it could not be disabled without manually changing it in the phone or a factory default.
I fixed the voicemail access number (this was hard coded to *98)
Removed unsupported P values and added many hidden values that cannot be configured on the app but are present in the default app config file
TLS support (you can now easily toggle TLS using default settings)
Added grandstream_config_server_path, http_auth_username/password (useful if you want to point to another PBX)
* Update Grandstream provisioning
* Add Vtech
* Create app_config.php
fix typo
* Update app_config.php
remove newline at end as it can break php
* Update app_config.php
remove newline at end as it can break php
* Create app_config.php
remove newline at end.
* Update app_config.php
remove trailing newline
* Create device_edit.php
Add both http and https
* Create app_config.php
remove newline
* Add gxp16xx and fix typos
