Implement exponentiation operator `**` as well as __builtin_pow (used for exponentiation operator).  Use of exponentiation operator with constants results in const folded (precomputed at compile time exponentiation), otherwise runtime exponentiation with some clever loops (slow!).
They see me roll 'n, casting, so far they just think I'm implicit casting dirty, implicity casting dirty ..
Get rid of the bullshit log stuff
Make ** RIGHT associative
Add some ice
Actually generate an ast_call for __builtin_pow for the ** operator, otherwise the operator yeilds a ast_function, making "a ** b" not work, but since it's a function, allows **(a, b). Also added tests for exponentiation operator.
Implemented __builtin_exp
Implemented concept of enumeration attributes (can be further extended, but currently only "flag" is implemented as an attribute).  An enumeration with a flag attribute will act as a "flagged enumeration", one that automatically handles exponentiation of the constants defined inside it, i.e enum : flag { A, B, C }, A,B,C will equal 2, 4, 8.
Implemented __builtin_mod, and % operator. Added floor builtin to the standalone executor.  Mod works so long as the compiler can find a suitable definition of "float floor(float)", otherwise it prints a diagnostic and gives up (original id1 Quake had floor so we can depend on it).
Better diagnostic when "floor" cannot be found.
Fix operator precedence, closes #101
Implemented "reverse" enum attribute, e.g enum : reverse { A, B, C, D } -> A,B,C,D = 3,2,1,0
Add floor to tests defs.qh
Implemented smart intrinsic / builtin system.  When you use trivial math functions like "pow", if they don't exist as a builtin, the compiler will implement its own versions, likewise, if a compiler builtin depends on a function that exists, it will use it, likewise if it doesn't it will implement it.  If you explicitally use __builtin_ (prefixed) versions, the compiler again will select the best option it can, be it a combination of both builtins and compiler builtins, all compiler builtins, OR, all builtins (most performant).
Uh wrong file.
fix comment
Added isnan compiler builtin, documented what each compiler builtin does as well.
Added gource rule to makefile
SPACES PEOPLE
*sigh*