[Open-graphics] video head 0 module template

[Timothy Miller]

I had a quick glance.  Looks nice.  I suggest, instead of changing the
ddrff definition in the synthesizable part, add this code to your test
bench:

module FDDRRSE(Q, C0, C1, CE, D0, D1, R, S);
output Q;
reg Q;
input C0, C1, CE, D0, D1, R, S;
always @(posedge C0) Q <= D0;
always @(posedge C1) Q <= D1;
endmodule