PackageLoader rewrite * GameMenu games can have a Main method instead of a menu * Decoupled TypeLibrary and assembly loading * PackageLoader is responsible for loading packages into a LoadContext * PackageLoader.Enroller is responsible for enrolling loaded assemblies into TypeLibrary etc * A PackageLoader can have multiple Enrollers (needed for Editor) * Round the chunks in Graphics.Draw so when drawing Triangles they don't end up hanging over the chunk boundary * Add Draw.SolidTriangle