Make navmesh rasterization on the navigation regions and map more lenient by starting out with a lower internal cell scale by default and changing the merge error to just warning that can be toggled.
In NavMap2D::_update_rvo_obstacles_tree() check if the NavObstacle2D
has avoidance enabled before adding it to the tree.
This is the 2D fix for #108259
`erase_unordered` should be preferred over `erase` where order is not important, for its performance benefits.
Co-authored-by: smix8 <smix8@users.noreply.github.com>
