added basic support for embedded rust generation

btypes_primitives/src/main/rust_embedded/bmachine/Cargo.toml

btypes_primitives/src/main/rust_embedded/btypes/Cargo.toml

..._primitives/src/main/rust_embedded/btypes/src/bboolean.rs

..._primitives/src/main/rust_embedded/btypes/src/binteger.rs

...primitives/src/main/rust_embedded/btypes/src/brelation.rs

btypes_primitives/src/main/rust_embedded/btypes/src/bset.rs

btypes_primitives/src/main/rust_embedded/btypes/src/lib.rs

src/main/java/de/hhu/stups/codegenerator/CodeGenerator.java

...n/java/de/hhu/stups/codegenerator/CodeGeneratorUtils.java

src/main/java/de/hhu/stups/codegenerator/GeneratorMode.java

...de/hhu/stups/codegenerator/definitions/SetDefinition.java

...e/hhu/stups/codegenerator/definitions/SetDefinitions.java

.../stups/codegenerator/generators/DeclarationGenerator.java

...u/stups/codegenerator/generators/ExpressionGenerator.java

.../hhu/stups/codegenerator/generators/MachineGenerator.java

...stups/codegenerator/generators/SubstitutionGenerator.java

.../de/hhu/stups/codegenerator/generators/TypeGenerator.java

...n/resources/de/hhu/stups/codegenerator/RustTemplate_e.stg