The envelope clicks when stopping a voice to start a new one

[jpcima]

Make it a clean transition.

[jpcima]

When ADSR.cpp is edited to not restart at 0 after a re-trigger, ADSR looks better but sound is still clicking.

It's by applying this change:

	//bool bRestart = phase==kAdsrAttack;
	bool bRestart = phase==kAdsrAttack && previousPhase==kAdsrIdle;

Before

After

To check whether the retrigger is resetting oscillator's phase (which it shouldn't)

[jpcima]

It should be fixed, testing needed