fix bug in AssemblyParserService's caching logic -> request for internal members was ignored when loading assemblies from disk
fix bug in InsertMissingTokensDecorator: unbound generic types have an Identifier node that is null (thus frozen)
try to create an IAssemblyModel for assemblies that cannot be found in the IClassBrowser
add escape/unescape methods for DecompiledTypeReference.TypeName
use unresolved member to retrieve the icon for the tree node
use specific DebuggerProcessEntityModelContext with all modules as references, to make resolving work properly
fix conflict in Escape/UnescapeTypeName
UnpinnedAssemblies collection as unpersisted version of MainAssemblyList in IClassBrowser.