NoiseMap 3D propagation on 2D½ digital elevation model

Work of @sqi0081, @Adrien-lb:

 - Attenuation of sound level caused by ground reflection ex: Grass=0 Dirt=0.7 Concrete=0
 - Ground noise barrier using digital elevation model (x,y,z point cloud)
 - Horizontal edge diffraction contribution. If buildings height is provided.
 - H2GIS spatial database support
 - NMPB 7,8,9,10 unit test. Error up to 3.2 dB
 - Multi-thread computation on group of receivers.
 - Split into two modules.Computation core and spatial database integration.