Implement invulnerability/intangibility and sakurai angle (#78)

Reviewed-on: #78
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

src/game_settings.rs

@@ -45,6 +45,17 @@ pub struct FighterSettingsCommon {
 
     pub intangible_color: Color,
     pub intangible_pulse_duration: u32,
+
+    pub angel_platform_invulnerability_duration: u32,
+
+    /// When hit while the receiver is in the air, use this angle
+    pub sakurai_angle_aerial_angle: FGi32,
+    /// When hit while the receiver is in the ground and at low knockback, use this angle
+    pub sakurai_angle_low_knockback_angle: FGi32,
+    /// When hit while the receiver is in the ground and at high knockback, use this angle
+    pub sakurai_angle_high_knockback_angle: FGi32,
+    /// past this threshold, the knockback is considered high, so it will use [sakurai_angle_high_knockback_angle]
+    pub sakurai_angle_knockback_threshold: FGi32,
 }
 #[derive(Reflect, Serialize, Deserialize, Clone)]
 #[reflect(opaque)]