More flexible type conversions while injections

[VitaliyMF]

The component may have a dependency type which is generally compatible with injected implementation but this conversion is not supported by default type converters. For example DictionaryDescriptor always constructs IDictionary<string,object> and if dependency type is IDictionary<string,string> there will be an injection error. It is possible to have type converter that handles that automatically and creates compatible implementation if possible.

In general, it makes sense to introduce some kind of ITypeConverter to allow app-specific extensions for the implicit type casts.