add pipe_pistol to PlayerController

[loteque]

• create new instanced scene from gun component and name it pipe_pistol
• create add sprite to pipe_pistol.tscn
• instantiate child scene from pipe_pistol in player controller.

https://github.com/loteque/wasteland-warrior/assets/69282314/f0d45969-d036-4afc-97ba-9fb3380d735e

https://github.com/loteque/wasteland-warrior/assets/69282314/dba8116e-ff72-444a-839c-783c36dfa679

• closes https://github.com/loteque/wasteland-warrior/issues/156

[jonathandavidlewis]

@loteque Oh, can you change the title of the PR so its more meaningful when viewed in the PR list later?

[loteque]

Name: PipePistol.tsn instead of pipe_pistol.tscn

I dig the guns directory. Other than that, works for me!

This was indeed very easy to review. Bravo! 💯

I was thinking we should use snake_case for tscn files that are not meant to be reusable or inheritable. What do you think?