Added parsing for variables and function definitions

...sarennes/nperier/minichamo/language/typing/AliasType.java

...rennes/nperier/minichamo/language/typing/BuiltinType.java

...ennes/nperier/minichamo/language/typing/FunctionType.java

...rennes/nperier/minichamo/language/typing/GenericType.java

...sarennes/nperier/minichamo/language/typing/NupleType.java

...insarennes/nperier/minichamo/language/typing/SumType.java

...in/java/fr/insarennes/nperier/minichamo/lexing/Lexer.java

...insarennes/nperier/minichamo/lexing/tokens/CharToken.java

...rennes/nperier/minichamo/lexing/tokens/OperatorToken.java

...java/fr/insarennes/nperier/minichamo/parsing/Context.java

...nsarennes/nperier/minichamo/parsing/DefinitionParser.java

.../java/fr/insarennes/nperier/minichamo/parsing/Parser.java

...a/fr/insarennes/nperier/minichamo/parsing/TypeParser.java

...r/insarennes/nperier/minichamo/parsing/TypedefParser.java