Explore other scan aggregation methods

[mpowelson]

Right now the only method implemented is using a colorized octomap_server. However, there are other methods that could be explored.

• Texture mapping - Save all images in scan to a directory and then stitch them back together at the end.
• Custom octomap server that integrates detections more robustly. The octomap server colorizer just averages the current voxel with the incoming color to get the new color.

[mpowelson]

See PCL Texture Mapping example for one method