Introduce an asset cooking bypass mode

[Xymanek]

Add a new build option (intended to be used by separate build config) that will cause X2MBC to copy the assets inside ContentForCook as-is.

Things to consider:

• Shaders (do we need to pass them through the precompiler when bypassing?)
• Dependencies that are not shipped seekfree (that the cooker will normally inline into mod's SF packages). Possibly could use PkgInfo to get a list of dependencies (and include automatically), but keeping track of which ones are SF/always loaded will be a lot of code. This is also not needed if the game is going to be run with -noSeekFreeLoading

Reasons:

• When initially setting up assets, it's better to first test them uncooked (even if planning to eventually cook them from the start). Current;y this requires manually moving them around (which could be especially annoying if version control is involved)
• When working on code, we want to skip the lengthy cooker step (although Asset cook "is needed" check ala shader cache #15/Prototype for timestamp-hash based incremental build steps #43 are probably a better solution)
• When running the game with -noSeekFreeLoading, mod's TFC are also ignored - streamed textures are just black in-game (although everything else is loaded from SF packages just fine)