Renaming and documentation for type systems

src/qir/driver/sql/QIRSQLTypeSystem.java

src/qir/typing/QIRDefaultTypeSystem.java

src/qir/typing/QIRDefaultTypeSystemVisitor.java

src/qir/typing/QIRGenericTypeSystem.java

src/qir/typing/QIRSpecificTypeSystem.java

src/qir/typing/QIRTypeErrorException.java

src/qir/typing/QIRTypeSystem.java