parser.py: Removing all print statements for control statement implementations
parser.py: Updating todo comments
examples/: Adding writeln pascal example
parser.py: Implementing writeln system call
parser.py: Updating postfix method to generate instructions for pushing strings onto the stack
simulator.py: Implemented writeln system procedure
simulator.py: Fixing implementation of mod op_code
examples/: Updating factorial and for Pascal examples
examples/: Updating all examples syntax
parser.py: Adding program header into program declarations
examples/: Adding program names to all examples
simulator.py: Updating simulator to remove print statements, updating for.pas example
simulator.py: Fixing order of operands inside of op codes