Log Message:
geography/draco: Add 1.5.7

Draco is a library for compressing and decompressing 3D geometric
meshes and point clouds. It is intended to improve the storage and
transmission of 3D graphics.

Draco was designed and built for compression efficiency and speed. The
code supports compressing points, connectivity information, texture
coordinates, color information, normals, and any other generic
attributes associated with geometry. With Draco, applications using 3D
graphics can be significantly smaller without compromising visual
fidelity. For users, this means apps can now be downloaded faster, 3D
graphics in the browser can load quicker, and VR and AR scenes can now
be transmitted with a fraction of the bandwidth and rendered quickly.

Draco is released as C++ source code that can be used to compress 3D
graphics as well as C++ and Javascript decoders for the encoded data.