Simplify the iteration logic in OscInterface

[aalex]

As developers, we want code that is easy to read, inderstand and maintain.

The logic for string tokenizing in OscInterface is quite convoluted. It would be useful to make it a lot simpler and easier to read.

It's not very clear what QPair<QString,QString> OscInterface::next(const QString& path) does. It splits a string into token. Instead, but one by one. Instead, we could very well write a static function that returns list of tokens. (instead of an iterator) Also, it doesn't need to be a member of that class. I think the code also needs more comments.

[sofian]

I agree this code could really be improved.