In preparation for converting all of the vec_t[3] to qvec's, the Vector routines are now templated and work with any type that provides indexing operators.
Polylib.cc is gone, since this all needs to be in header now
qvec can now implicitly convert from T[N]
constexpr where appropriate
static inline -> inline
side_t is now an enum, moved into mathlib
typedef -> using
include guards -> pragma once
typedef struct x { } y; -> struct y { }
some fixes to extremely old code that shouldn't be required any more