Add ranged attack as Slinger fighter default attack

[Zac8668]

Closes #268

[odecay]

Just pulled and tested, the arc and targeting is really cool!

There seems to be an issue with the targeting AI where sometimes they will turn around and fire backwards/away from the players.

[Zac8668]

There seems to be an issue with the targeting AI where sometimes they will turn around and fire backwards/away from the players.

Yeah, not sure why that happens, gonna try to fix it.

[odecay]

bors merge

[bors[bot]]

Build succeeded:

• Check Rust formatting
• Clippy correctness checks (wasm32-unknown-unknown, web-target)
• Clippy correctness checks (x86_64-unknown-linux-gnu, target)