Integrate gatewayapi.com for SMS sending

[AlexTr]

We need to create sys_objects_smsproviders table which will store all possible SMS integrations, so 3rd-party modules will be able to add own integrations.

sys_objects_editor can be used as example of similar method.

• [ ] remake SMS sending to use universal class
• [ ] integrate gatewayapi.com

[jwldk]

I work for gatewayapi.com. Let me know if you have issues integrating.

[AlexTr]

Thank you @jwldk for coming in, we'll let you know if we have any issues.