Use static typing in all scripts (#208)

Use a deadzone of 0.2 for all actions, allow gamepad input from all d…

…evices

This matches input recommendations in recent Godot versions.

Merge pull request #108 from Calinou/use-physical-key-inputs

Use physical key inputs for player movement

Merge pull request #95 from aaronfranke/update-3.2.4

Update to Godot 3.3

Merge pull request #96 from aaronfranke/player-step

Fix player step sound

Merge pull request #90 from aaronfranke/script-commas-compat

Add commas and tweak scripts for better compatibility with Godot 4

Merge pull request #77 from aaronfranke/bullet-aim

Prevent aiming at other bullets by setting their collision layer to zero