Backports features and bugfixes from current Godot 4.0 to 3.5 and brings functions and codebase of both version largely in sync to make tutorials more compatible and future backports easier.
- smix8
8bd7c6188b
Changes NavigationAgent avoidance callback to a toggle that is disabled by default.
Also fixes a few missing descriptions / wrong warnings.
(cherry picked from commit 7f3688603cb3662e425cb7a1dce15459162c1dc6)