Implement land from below, fix attacks not lifting fighters off the ground (#96)

Reviewed-on: #96
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

src/fighter/state/mod.rs

@@ -273,10 +273,10 @@ impl CollisionContext<'_> {
 
     pub fn air_collide_with_stage(
         &mut self,
-        can_ignore_soft_platforms: bool,
+        mut options: crate::fighter::collision::AirCollisionOptions,
     ) -> Option<crate::fighter::collision::AirCollisionWithStageResult> {
         let ignored_polys = self.surface.ignored_polygon_ids();
-        let ignore_soft_platforms = can_ignore_soft_platforms
+        options.can_pass_through_soft_platforms = options.can_pass_through_soft_platforms
             && self.input.get_last_frame().movement.y <= -self.downward_stick_threshold;
         crate::fighter::collision::air_collide_with_stage_substepped(
             self.prev_translation,
@@ -286,7 +286,7 @@ impl CollisionContext<'_> {
             self.desired_ecb,
             self.stage_collision,
             &ignored_polys,
-            ignore_soft_platforms,
+            options,
         )
     }
     pub fn air_collide_with_ledges(