Version 0.1.5

No feature updates/syntax changes, but there is significant memory and file size reduction. I didn't know that C++ has implicit copying in functions and variables instead of sending references (like other languages do when it's a non-primitive value), so I changed a lot of general code, constructors, and my special copy functions.

Also there is an even bigger file size reduction in the Windows (.exe) version because I decided to turn on compiler optimizations at level O2