initial commit

took me a day to make the base...
...and ~12 hours to write a reader that reads 100% of all demo songs in
1.0

src/engine/sample.h

@@ -0,0 +1,7 @@
+struct DivSample {
+  String name;
+  int length, rate;
+  char vol, pitch, depth;
+  short* data;
+  char* data8;
+};