Moved lua scripts for better project structure.
More shadowspawn content.

Simple blight distribution will no longer place blight on civ starting
plots.

Darkhounds now have a unit flag.

Changed colors for shadowspawn civ to differentiate from barbarians.

Added BlightUtils.lua as a script where Blight-related functions can be
stored. Will most likely be just used in VFS and called by other lua files
eventually.