Bitwise xor binary operator added using ^

[Axanimander]

Added bitwise XOR function using ^ with an example program which successfully compiles and runs (bitwise.prse).

Files Modified:

• prse.y
• prse.l
• expressions/Expressions.h

Files added:

• Bitwise.h
• Bitwise.cpp

Why?

I noticed the ^ token was in the parser and unused. I also wanted to possibly add things like bit shifts in the future.

Does it work?

Yes, I wrote a program that used the new binary operator and verified correct output.

Prove it?

[Asterisk007]

@Axanimander good work, thanks for the contribution. I have a few requests before I accept the PR:

• Remove the spare println("hello world") in examples/bitwise.prse. It seems unnecessary and unrelated to the example in question.
• Show that the syntax error handling you included matches with the other existing syntax error handlers in the other operators. Testing extends to validating incorrect usage, not just correct usage.
• Also, I would appreciate it if you also followed the general formatting style established in the other example PRSE files, just for the sake of cohesion. If you leave it alone I'm just going to change it myself for the official release :P

I look forward to any future PRs from you!