Media key support

[djyde]

Considering support media key(previous, next, play/pause)

[0xWDG]

I don't know exactly how you want to use it, but it is supported see: https://github.com/djyde/WebShell/blob/master/WebShell/WebShellMediaKeysSupport.swift#L20

[djyde]

Actually, what i want is explosing an event listener API which let WebShell can tell the website what media key the user press. It is a very useful feature for the video web application.

[0xWDG]

I got (for now)

        "MediaKeys": [
                    // Enable "Back" & "Forward" (for browsing)
                    "BackAndForward": true,

                    // Media Player support (experimental)
                    "MediaPlayers": false
                ],

i'll make a event trigger API later.

---

the thing what makes the media keys support hard, is that via the media keys interface we can't communicate directly to the view controller unfortunately.

https://github.com/djyde/WebShell/blob/master/WebShell/WebShellMediaKeysSupport.swift