static_aabb2d_index | Fast static 2D axis aligned bounding box index

use static_aabb2d_index::*;
// create builder for index containing 4 axis aligned bounding boxes
// index also supports integers and custom types that implement the IndexableNum trait
let mut builder: StaticAABB2DIndexBuilder = StaticAABB2DIndexBuild  

def make_lowshelf(
    frequency: int, samplerate: int, gain_db: float, q_factor: float = 1 / sqrt(2)
) -> IIRFilter:
    """
    Creates a low-shelf filter

    >>> filter = make_lowshelf(1000, 48000, 6)
    >>> filter.a_coeffs