Demo commit

The audio output is still messed up, but this commit gets everything as
ready as it can get. Fixed up all the testbenches and added state
machines for everything

verification/segment_display/seconds_display_tb.sv

@@ -16,7 +16,7 @@ wire [6:0] display_ones;
 logic [6:0] expected_tens;
 logic [6:0] expected_ones;
 
-seconds_display Dut(.*);
+sixty_display Dut(.number(seconds),.*);
 initial begin
     $display("Testing seconds_display");
     for (seconds=0; seconds<60; seconds++) begin