* Detect more loop closures from/to specific map ID only option
* default value -1
* Added elapsed time
* Avoid loading ALL signatures in RAM, only load them when necessary
* Avoid creating flann index when initializing with Kp/NNStrategy>=3
* Setting opt params by default
* GridMap integration
* Removed GridGlobal/FullUpdate parameter. Bump version 0.21.3. Mvoed specialized global map classes under global_map sub dir. Renamed Map -> GlobalMap.
* UI: Added elevation map visualization
* Added LocalGridCache class to share cache between global maps
* Fixed OctoMap nans. DbViewer: Added frontiers visualization.
* convenient functions for ros
* Small fix
* fixed build without GridMap
* CI disabled fail-fast
* CI updated checkout action to v4