Pack Energy Pellet assets

[BenVlodgi]

Add precompiler that autopacks the pellet assets and the BEEMOD script. With this, people will no longer need to download the BEEMOD to play these maps.

This way, if they revert the precompiler, the assets wont get packed, and it will notify downloaders that they need the BEEMOD to play.

[TeamSpen210]

Not sure what this is about, though the VRAD part of the 2.4 has an autopacking component that can be used separately - it analyses the maps and resources to determine dependencies.

[vrad-exe]

This doesn't seem too useful? If you're on an OS where this theoretical precompiler works, then BEE2.4 probably does as well, in which case you might as well just use that.