Use external interactor bridge rather than reimplementing interactions

[Meakk]

Related issue: f3d-app/f3d#418

Currently, the app is reimplementing camera movements in Java.
It would be much better to factorize the code in libf3d.

Here are the requirements:

• Up direction lock like in the desktop app
• Sometimes pinching rotates the model instead of zooming only

[Meakk]

Needs multi-touch support in libf3d

[Meakk]

The version reimplemented does not support up direction locking too.