Fix Path::find for absolute paths

[Sygmei]

Path::find method does not work for absolute paths

We might need to remove implicit_root_path and try to detect absolute paths instead so they ignore prefixes

[Sygmei]

Easiest way to test the issue is to have an empty project with the following boot.lua

boot.lua

function Game.Start()
  Engine.Scene:load_from_file("/some/absolute/path/to/scene.vili")
end