Add ledge getup, ledge intangibility limit & fix walk-off velocity (#93)

Reviewed-on: #93
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

src/fighter/state/ground.rs

@@ -213,7 +213,7 @@ pub fn collide_with_stage_grounded(
                 state_context.surface.land(StageLineID {
                     polygon: current_line_id.polygon,
                     segment: segment_idx,
-                });
+                }, state_context.ledge_info);
                 GroundedMotionResult::InGround
             }
             GroundedPositionResult::InAir => {
@@ -246,7 +246,7 @@ pub fn collision_interrupt(ctx: &mut CollisionContext, can_walk_off: bool) -> Op
 mod tests {
     use super::*;
     use crate::fighter::ecb::FighterPreviousECB;
-    use crate::fighter::{FighterECB, FighterPreviousTranslation, FighterSurfaceState};
+    use crate::fighter::{FighterECB, FighterLedgeInformation, FighterPreviousTranslation, FighterSurfaceState};
     use crate::math::rect::FGRect;
 use crate::stage::line::StagePolyType;
     use crate::input::FighterInput;
@@ -371,6 +371,7 @@ use crate::stage::line::StagePolyType;
         let mut translation = FighterTranslation(FGVec2::lit("11", "0"));
         let previous_translation = FighterPreviousTranslation(translation.0);
         let mut velocity = FighterVelocity::default();
+        let mut ledge_info = FighterLedgeInformation::default();
         let mut ecb = FighterECB {
             bottom: FGVec2::lit("0.0", "-0.5"),
             top: FGVec2::lit("0.0", "0.5"),
@@ -386,6 +387,7 @@ use crate::stage::line::StagePolyType;
             velocity: &mut velocity,
             surface: &mut surface,
             ecb: &mut ecb,
+            ledge_info: &mut ledge_info,
             prev_ecb: &previous_ecb,
             stage_collision: &stage_collision,
             leave_ground_ecb_lock_duration: 10,
@@ -395,7 +397,6 @@ use crate::stage::line::StagePolyType;
                 origin: FGVec2::ZERO,
                 end: FGVec2::ZERO,
             },
-            ledge_grab_lockout_active: false,
         };
 
         assert!(matches!(
@@ -440,6 +441,7 @@ use crate::stage::line::StagePolyType;
         };
         let previous_ecb = FighterPreviousECB::from(ecb);
         let mut presentation_snap = crate::fighter::FighterPresentationSnap::default();
+        let mut ledge_info = FighterLedgeInformation::default();
         let mut context = CollisionContext {
             translation: &mut translation,
             prev_translation: &previous_translation,
@@ -447,6 +449,7 @@ use crate::stage::line::StagePolyType;
             velocity: &mut velocity,
             surface: &mut surface,
             ecb: &mut ecb,
+            ledge_info: &mut ledge_info,
             prev_ecb: &previous_ecb,
             stage_collision: &stage_collision,
             leave_ground_ecb_lock_duration: 10,
@@ -456,7 +459,6 @@ use crate::stage::line::StagePolyType;
                 origin: FGVec2::ZERO,
                 end: FGVec2::ZERO,
             },
-            ledge_grab_lockout_active: false,
         };
 
         assert!(matches!(