Go back to resetting the refresh counter after a DMA. Probably not quite correct as it is probably reset on VDP triggered refresh, but this is close enough for now given the general limitations with my refresh code. VDP FIFO Testing seems to be passing 100% reliably again (was occassionally failing still with the last commit)

#ifndef HASH_H_
#define HASH_H_

#include <stdint.h>

//NOTE: This is only intended for use in file identification
//Please do not use this in a cryptographic setting as no attempts have been
//made at avoiding side channel attacks

void sha1(uint8_t *data, uint64_t size, uint8_t *out);

#endif //HASH_H_