Internals: Nav: shallow refactor.
Internals: Nav: shallow refactor.

ggtucker/imgui,ggtucker/imgui,ocornut/imgui,nProtect/imgui,nProtect/imgui,bkaradzic/imgui,Flix01/imgui,aimotive/imgui-glfw,Flix01/imgui,aimotive/imgui-glfw,ggtucker/imgui,nProtect/imgui,bkaradzic/imgui,bkaradzic/imgui,ocornut/imgui,ocornut/imgui,Flix01/imgui