MinoInstrumentedAnimation: handle note and user created item

MinoInstrumentedAnimation now use new class MinoInstrumentNoteEvent to forward note item creation in processNotesEvents().
Note: each inhereted class should call processNotesEvents() in its animate() function to handle note events.

MinoInstrumentedAnimation now handles async item creation.
Note: each inhereted class should call processItemCreation() in its animate() function to handle user item creation.
MinaFallingObjects: use new MinoInstrumentedAnimation functions

This is magic :-)
MinaRandomPixels: use new MinoInstrumentedAnimation functions

This is magic \o/