Added special cases for the unary negation operator and a few other things
treee17114c3c2af89f33f07c22a02e79c4938cb91f3
drwxr-xr-x - frith
-rw-r--r-- 717 function.cpp
drwxr-xr-x - intermediary
drwxr-xr-x - interpreter
drwxr-xr-x - lexer
-rw-r--r-- 682 main.cpp
-rw-r--r-- 1377 symbol.cpp
drwxr-xr-x - variable