Parse IF command
readCmd, writeCmd, assignCmd
structure of evaluator
Parse while, Eval read, write
App skeleton for parse -> eval
Evaluator: Assignment Stmt

Signed-off-by: Norbert Scheller <nscheller@actian.com>
While statement
renaming

Signed-off-by: Norbert Scheller <nscheller@actian.com>
Renaming

Signed-off-by: Norbert Scheller