Version string format

Factorio uses a common encoding method to serialize the version string in binary data that's present in multiple places, such as the map exchange string and save game file format. It consists of four consecutive 2-byte unsigned little-endian values. We'll use version 0.14.21 as an example:

unsigned short	Factorio's major version number (e.g. 0)
unsigned short	Factorio's minor version number (e.g. 14)
unsigned short	Factorio's patch version number (e.g. 21)
unsigned short	Factorio's developer version number