…m option class. (#4016)
Enabled by #4012.
* Add a min_track_length option in colmap BA.
* Drop custom option class and directly store
colmap::BundleAdjustmentOptions.
* Align the new names in option manager.
* Drop the confusing "optimize_rotations" option as the default in
global mapper is to run BA for two times (one with rotation fixed and
one with full BA). Add an option to skip the fixed-rotation stage in
bundle adjustment in the global pipeline, and default it to false.
We therefore can drop the custom BA wrapper in glomap and directly use
the colmap one in the global mapper.
Logic is kept equivalent to before.