Implement hitstop shake (#42)

Reviewed-on: #42
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

src/game_settings.rs

@@ -31,6 +31,11 @@ pub struct FighterSettingsCommon {
 
     /// Angle diff from straight up under which the attack will force an airborne state 
     pub attack_ground_to_airborne_transition_vertical_angle_threshold: FGi32,
+    pub visual_shake_frames_per_hitstop_frame: FGi32,
+    // offsets applied when the fighter is in hitstop
+    pub visual_shake_table: Vec<f32>,
+    /// The attacker will always get less hitstop
+    pub attacker_visual_shake_multiplier: f32,
 }
 #[derive(Reflect, Serialize, Deserialize, Clone)]
 #[reflect(opaque)]