Add the path to a vocabulary tree when chosen "vocab_tree" as colmap_matcher
using vocabulary tree give better results https://demuc.de/colmap/

handle reflection case with small noise

handle exception for the opposite direction input

- orientable crop volume
- extra python bindings
- better visualization of cameras
- a number of fixed crashes

(Forgot it in previous commit)

I believe this should have been done by 986af675

When passing parameters to Colmap2Nerf the system calls example: --video_in "D:/DataSet Videos/Video.mp4" Won't recognize path as a whole paramter due to Absence of Double Quoations, so argparse interpret it as  "D:/DataSet" only and "Videos/Video.mp4" as an another argument.

Add 'SIMPLE_PINHOLE' and 'PINHOLE' camera models.

add a parameter to take start and end time, to extract images from the
video only within the given time slice

Signed-off-by: Ameya Shenoy <shenoy.ameya@gmail.com>

Correcting previous mangling of the indentation