Added support for handling boards without builtin speakers

[brentru]

Uses tone() from simpleio to avoid using builtin speakers on boards without them (square wave instead of sine wave for a piezo)

@ladyada

[ladyada]

looks good, please refactor to avoid the big code dupliation!

+            p = None
+            d = duration
+            if note[0].isdigit():
+                d = int(note[0])
+                p = note[1]
+            else:
+                p = note[0]
+            if "." in note:
+                d *= 1.5
+            if "#" in note:
+                p += "#"
+            o = octave
+            if note[-1].isdigit():
+                o = note[-1]
+            p = o + p

etc

[tannewt]

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