MZX save file format extensions

These all are stored after the counters in the save file.

Byte(s)		

00-1023				Sprites (16 bytes each * 64)
1024				Total sprite count
1025				Sprite y_order flag
1026-1091			Sprite collision info (66 bytes)
1092-2115			Strings (16 bytes each * 64)
2116-2117			Math multiplier
2118-2119			Math divider
2120-2121			Circle divider
2122-2133			Input file name
2134-2137			Input file position
2138-2149			Output file name
2150-2153			Output file position



