Refactoring code / a bit of cleanup

[jlucidar]

I starting to refactor the app, before it start being a mess :)

[omouren]

For me all presets are broken except for the new one "Video Stream Service" that works like before. I have a glitchy video or nothing with others.

[jlucidar]

@omouren. I haven't payed attention to other preset btw, as It's a major rework of the streaming internals, it may have broke some stuff... Will have a deeper look ^^