Add the ability to respawn and improve controller port mapping (#72)

Reviewed-on: #72
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

src/fighter/state/angel.rs

@@ -0,0 +1,53 @@
+use crate::{fighter::{animation::AnimKind, state::{FighterState, FighterStateImpl, air::AirborneStateCommon, fall::FallState}}, math::vec::FGVec2};
+
+#[derive(Debug, Clone, Hash)]
+pub struct AngelState {
+    frames_remaining: u32
+}
+
+impl AngelState {
+    pub fn new(duration: u32) -> Self {
+        Self {
+            frames_remaining: duration
+        }
+    }
+}
+
+impl FighterStateImpl for AngelState {
+    const NAME: &'static str = "Angel";
+
+    fn check_interrupt(&self, state_context: &mut super::InterruptContext) -> Option<super::FighterState> {
+        let moved_sideways = !state_context.input.get_last_frame().movement.x.is_zero();
+        let moved_vertically = !state_context.input.get_last_frame().movement.y.is_zero();
+
+        if self.frames_remaining == 0 || moved_sideways || moved_vertically {
+            Some(FighterState::Fall(FallState::new(AirborneStateCommon::default())))
+        } else {
+            None
+        }
+    }
+
+    fn update(&mut self, _state_context: &mut super::UpdateContext) {
+        self.frames_remaining = self.frames_remaining.saturating_sub(1);
+    }
+
+    fn is_visually_grounded<'a>(&'a self) -> bool {
+        false
+    }
+    
+    fn on_enter(&mut self, state_context: &mut super::EnterContext) {
+        state_context.play_animation(AnimKind::Wait, true);
+        state_context.velocity.0 = FGVec2::ZERO;
+    }
+    
+    fn check_collision_interrupt(
+        &mut self,
+        _state_context: &mut super::CollisionContext,
+    ) -> Option<super::FighterState> {
+        None
+    }
+    
+    fn surface_policy(&self) -> super::SurfacePolicy {
+        super::SurfacePolicy::Airborne(crate::fighter::surface::EcbLockPolicy::Clear)
+    }
+}