add: multi-instruments + limit notes sounds range at loading (memory optimization) + show message when beginning to load instruments + instruments settings moved to its own preferencescreen + generic Instrument::extrapolateSoundNotes() + notes extrapolation can now downpitch (before it only up-pitched) + optimized bitmap drawing (memory optimization) + setUpBoard(boardName) -> setUpKeyBoard() to avoid confusion with setUpBoard(orientationId) the object initialisation + SoundPool singleton (memory optimization) + mInstrument moved from HexKeyboard to Play (memory optimization for multi-instruments)
update: R.java

Signed-off-by: Stephen L. <lrq3000@gmail.com>