New features - Some issues to be solved

[Yarroudh]

Discussed in https://github.com/Yarroudh/Optim3D/discussions/6

^{Originally posted by Yarroudh April 13, 2023} I'm working on implementing new features:

• The possibility to choose between OcTree and KDTree indexing for 3D point clouds. The performances of both structures will be compared.
• Integrate ZRect3D as a part of Optim3D post-processing. The buildings ground-floor elevation should be automatically corrected at the end of the process.
• The docker image is now available. Some issues were caught while reconstructing the buildings.
• The processing areas should consider the buildings that are in the limits between two tiles.