TypeChecker class added

CMakeLists.txt

include/dusk/AST/DiagnosticsParse.h

include/dusk/AST/Expr.h

include/dusk/AST/Pattern.h

include/dusk/AST/Type.h

include/dusk/CMakeLists.txt

include/dusk/Sema/CMakeLists.txt

include/dusk/Sema/Context.h

include/dusk/Sema/Scope.h

include/dusk/Sema/Sema.h

lib/AST/Type.cpp

lib/CMakeLists.txt

lib/Sema/CMakeLists.txt

lib/Sema/Context.cpp

lib/Sema/Scope.cpp

lib/Sema/Sema.cpp

lib/Sema/TypeCheckDecl.cpp

lib/Sema/TypeCheckExpr.cpp

lib/Sema/TypeCheckStmt.cpp

lib/Sema/TypeChecker.cpp