* added tr069 enable and periodic_inform_enable vars to config templates add variable on dp750 template for enabling tr-069 provisioning.
* add vars to grandstream app default settings
* add if condition to use the variables.
* Update app_config.php
* Grandstream HT802 Added Offhook Auto-dial variables
* Grandstream HT802 Added Offhook Auto-dial variables
* Grandstream GRP261x Make Configuration Keypad Lock configurable, fix default
* Grandstream Add grandstream_dhcp_time_zone across all templates
* Yealink Added yealink_missed_calllog to control whether missed calls are logged or not
* Grandstream HT802 update variable name to not use dash (which was breaking the template)
Fix config URL so that the phones don't get an invalid URL when $domain_name is unset. They would previously receive `/app/provision` with no domain/ip included, which makes the phone unable to provision again once they have been added to the Devices page without manually re-setting the config URL or factory defaulting the device.
The alternative solution is that the PHP code could always ensure that the $domain_name variable is set even if the device doesn't exist. My suggestion is to see if it can be set to the same domain/IP as the original provision request from this unconfigured device
* Added the ability to pick the SIP account for the first two slots on each handset
* Revert to clean base
* Configurable firmware versions for Grandstream Devices
* Cleaned up duplicate P codes in gxv3504 prov, and spacing elsewhere
Updated or added configurable firmware versions to the remaining Grandstream configs
* Documented how to use the firmware version feature
* Formatting fix in Readme
