Wait for 50ms after reset (fixes #7)

to avoid hangs.
Fix suggested by @yxkalle based on jsidplay2

Author: drfiemost

exSID.c

@@ -557,7 +557,10 @@ int exSID_reset(void * const exsid)
 
 	xsdbg("reset\n");
 
-	xSoutb(xs, XS_AD_IOCTRS, 100);	// this will stall
+	// This will stall and sleep for 100us
+	xSoutb(xs, XS_AD_IOCTRS, 100);
+	// Reset needs some time to complete, sleep for 50ms
+	_xSusleep(50000);
 
 	xs->clkdrift = 0;