Auto copy GodotUtils.dll and GodotUtils.xml to Template's res://addons folder

[valkyrienyanko]

The following will speed up development and could also be done for the Visualize repo.

• Rename Dummy.tscn to something more appropriate (This is still the main scene)
• Auto copy the dll and xml to the specified path on game startup
• Do not crash program if cannot find path
• Add a LineEdit to specify a path and a button to do the auto copy attempt a second time if needed (e.g. specifying path for the first time)
• Do not auto copy if no path was specified