removed dependency on most std headers

src/tg/detail/constants.hh

src/tg/detail/functions/aabb.hh

src/tg/detail/functions/closest_points.hh

src/tg/detail/functions/contains.hh

src/tg/detail/functions/coordinates.hh

src/tg/detail/functions/minmax.hh

src/tg/detail/functions/mix.hh

src/tg/detail/functions/uniform.hh

src/tg/detail/limits.hh

src/tg/detail/macros.hh

src/tg/detail/operators/ops_triangle.hh

src/tg/detail/random.hh

src/tg/detail/scalars/half.hh

src/tg/detail/scalars/quarter.hh

src/tg/detail/scalars/scalar_math.hh

src/tg/detail/traits.hh

src/tg/detail/utility.hh

src/tg/std/io.hh

src/tg/typed-geometry-std.hh

src/tg/typed-geometry.hh