feat: compact strains (#32)

* store zero strains compactly

* added docs

* added proptest

* add feature to store strains compactly

* update ci

* rename CompactZerosVec to StrainsVec

* add size_hint for iter

* rename iter

* minor adjustments

* more minor adjustments

src/catch/difficulty/skills/movement.rs

@@ -4,6 +4,7 @@ use crate::{
         skills::{strain_decay, ISkill, Skill, StrainDecaySkill},
     },
     catch::difficulty::object::CatchDifficultyObject,
+    util::strains_vec::StrainsVec,
 };
 
 const ABSOLUTE_PLAYER_POSITIONING_ERROR: f32 = 16.0;
@@ -107,7 +108,7 @@ impl Movement {
         dist_addition / weighted_strain_time
     }
 
-    pub fn get_curr_strain_peaks(self) -> Vec<f64> {
+    pub fn get_curr_strain_peaks(self) -> StrainsVec {
         self.inner.get_curr_strain_peaks()
     }
 

src/catch/strains.rs

@@ -20,6 +20,6 @@ pub fn strains(difficulty: &Difficulty, converted: &CatchBeatmap<'_>) -> CatchSt
     let DifficultyValues { movement, .. } = DifficultyValues::calculate(difficulty, converted);
 
     CatchStrains {
-        movement: movement.get_curr_strain_peaks(),
+        movement: movement.get_curr_strain_peaks().into_vec(),
     }
 }