constructor
returns the values for arguments
sets value for storedArguments
the name of the function
the id of the function, assigned after checkAST has been called on this
if the function being called in in built QScript function
if the function being called is script defined or not, assigned after checkAST has been called on this
the line number (starts from 1) from which this node begins, or ends
stores the return type. Only stored after ASTCheck has checked it
to store functionCall nodes