refactor(fmod): move all original files into fmod directory

fmod/lib/freeverb/comb.cpp

@@ -0,0 +1,48 @@
+// Comb filter implementation
+//
+// Written by Jezar at Dreampoint, June 2000
+// http://www.dreampoint.co.uk
+// This code is public domain
+
+#include "comb.h"
+
+comb::comb()
+{
+	filterstore = 0;
+	bufidx = 0;
+}
+
+void comb::setbuffer(float *buf, int size) 
+{
+	buffer = buf; 
+	bufsize = size;
+}
+
+void comb::mute()
+{
+	for (int i=0; i<bufsize; i++)
+		buffer[i]=0;
+}
+
+void comb::setdamp(float val) 
+{
+	damp1 = val; 
+	damp2 = 1-val;
+}
+
+float comb::getdamp() 
+{
+	return damp1;
+}
+
+void comb::setfeedback(float val) 
+{
+	feedback = val;
+}
+
+float comb::getfeedback() 
+{
+	return feedback;
+}
+
+// ends