Broken DateTime and timing

It seems there was a bad crash in the Windows build. It seems related to something to how DateTime is handled in C#/Mono and Godot in Windows. This bug doesn't seem to hit Linux at all. I removed and replaced most of the code that uses DateTime for timing and related functionality. I hope to kindly get more feedback on this matter. Also added a vesrion information panel, in the first intro scene of the game, in order to better handle any future updates.