Add Route and Vehicle concepts and further validation

model_examples/saxony.transportation_network

...ork/text_dsl/ide/contentassist/antlr/DSLParserParser.java

..._dsl/ide/contentassist/antlr/internal/InternalDSLParser.g

...ide/contentassist/antlr/internal/InternalDSLParser.tokens

.../contentassist/antlr/internal/InternalDSLParserLexer.java

...contentassist/antlr/internal/InternalDSLParserParser.java

...l/ui/contentassist/AbstractDSLParserProposalProvider.java

...p/mdsd/transportation_network/text_dsl/DSLParser.xtextbin

...etwork/text_dsl/parser/antlr/internal/InternalDSLParser.g

...k/text_dsl/parser/antlr/internal/InternalDSLParser.tokens

...ext_dsl/parser/antlr/internal/InternalDSLParserLexer.java

...xt_dsl/parser/antlr/internal/InternalDSLParserParser.java

...twork/text_dsl/serializer/DSLParserSemanticSequencer.java

...work/text_dsl/serializer/DSLParserSyntacticSequencer.java

...ion_network/text_dsl/services/DSLParserGrammarAccess.java

...roup/mdsd/transportation_network/text_dsl/DSLParser.xtext

...ansportation_network/text_dsl/DSLParserRuntimeModule.java

...ortation_network/text_dsl/scoping/CustomNameProvider.java

...ation_network/text_dsl/validation/DSLParserValidator.java

...network/text_dsl/formatting2/.DSLParserFormatter.xtendbin