Turn on effect chain sanity checks

This will check for infs/nans in between the effect units and will clear
up most cases where projects with bad data would simply cut out all sound
at one point or be all silent. It comes with a slight performance hit of
some 2% more cycles. The down side is that now instead of cutting out
at the point of bad data some large signals will get through that could
potentially hurt equipment.

Resolves: #1048, #3685

src/core/EffectChain.cpp

@@ -202,22 +202,16 @@ bool EffectChain::processAudioBuffer( sampleFrame * _buf, const fpp_t _frames, b
 	{
 		return false;
 	}
-	const bool exporting = Engine::getSong()->isExporting();
-	if( exporting ) // strip infs/nans if exporting
-	{
-		MixHelpers::sanitize( _buf, _frames );
-	}
+
+	MixHelpers::sanitize( _buf, _frames );
 
 	bool moreEffects = false;
 	for( EffectList::Iterator it = m_effects.begin(); it != m_effects.end(); ++it )
 	{
 		if( hasInputNoise || ( *it )->isRunning() )
 		{
 			moreEffects |= ( *it )->processAudioBuffer( _buf, _frames );
-			if( exporting ) // strip infs/nans if exporting
-			{
-				MixHelpers::sanitize( _buf, _frames );
-			}
+			MixHelpers::sanitize( _buf, _frames );
 		}
 	}