Assembly Conflict Handling

[dustinlacewell]

We need to ensure that no mods claim to contain assemblies that have the same name. During mod enumeration and metadata loading, similar to when dependency resolution happens, is the best time for this to happen. If two mods have the same name, we should take appropriate action, by warning the user that ModA and ModB and ModF all claim to have preload or runtime assemblies by name Foo.dll or whatever, and that ModA's assembly will be used.

Or we can refuse to continue with the mod loading process.