Adds warnings when at least one of the input mesh surfaces is of wrong primitive type or has an empty vertex / index array as those broken input meshes would fail as both navmesh as well as later when creating debug meshes.
(cherry picked from commit 4185fce0eff4c0fc40f077120d0ed26220e6c995)
While default ReCast library has support for 0.0 'sample_distance' the Godot implementation does not an crashes.
Previously Godot would set all sample_distance values below 0.9 to 0 which causes the crashes.
This limits the sample_distance range selection to 0.1 - 16.0 and also clamps sample_distance that are below 0.1 before ReCast receives them.
(cherry picked from commit e33fa9d8331f38c8c404b9d6ea286eacb503d3bb)
