Vdbfusion Versions Save

• Minor changes on Python API.
• New method to merge incoming TSDF grids following the traditional TSDF equations, both for the update_tsdf and integrate methods.
• Add prune method to clean up the grid according to a weight threshold.
• Python bindings build now optional.

First open-source release. To give it a try just pip install vdbfusion or try out the Colab example