Update Notes for ver 1.4.5

Enabled Steam Cloud for syncing game progress between different machines.

Before launching the game, Steam checks the cloud to see if any save file has a newer version there, probably uploaded from a different machine than the one the user is currently on. If there is, it downloads it to the current computer and boots the game, letting the user access his latest progress. When the user closes the game, Steam uploads the save file to the cloud storage.