[Inspector] Enhance inspector and introduce annotation-based inspection
Enhance POM configuration
[Runtime] Add support for extension functions
[Transformation] Fix some linking and typing bugs
[Generator] Fix metamodel and transformer generators
[Maven] Fix loading of resources and also load external models
[Inspector] Remove incorrectly inspected enum literals
[Runtime] Add support for enums and enum literals
[Generator] Generate Enums and EnumLiterals in meta models
[Runtime] Add support for datatypes and datatypes transformation
[Transformation] Add language support for datatype transformation
[Generator] Correctly generate datatypes and datatype mappings
Add support for ClassLiterals
[MetaModel] Use methods to access and initialize metamodel
[Runtime unit tests] Add base expressions tests

Implemented unit tests for Exprresions class.