Added a property Resources to IAssembly and IUnresolvedAssembly.

This property contains all embedded (/resource csc command line option) and linked (/linkresource option) resources. There is also something known as an "asssembly-linked" resource, but this is not supported because my Google-fu has failed me in finding out what it actually is and how to create one.
Changed the IProjectContent Resources API to have methods AddResources/RemoveResources instead of different methods for different resource types.
Use ModuleDefinition.ReadModule instead of AssemblyDefinition.ReadAssembly when reading assembly resources
Merge branch 'resources'