Asset/Resource system

[peter-r-g]

Right now the asset/resource system is a bit all over the place. Firstly it currently has two names. In Mocha.Common it is referred to as Resources; Whereas in Mocha.Engine and the AssetCompiler it is referred to as Assets. As well, asset logic is spread across multiple projects. Ideally, we should have all of the assets in a single place that contains all of their functionality.

I suggest that we collect all of the asset-related code and put it under a single Mocha.Assets project. That way we have all of the required functionality in one place. With that, we also won't have to reference a tool for compiling logic.