feat: direction propagation, change direction at precise times

src/entity.rs

@@ -5,6 +5,7 @@ pub trait Entity {
     fn position(&self) -> (i32, i32);
     // Returns the cell position of the entity (XY position within the grid)
     fn cell_position(&self) -> (u32, u32);
+    fn internal_position(&self) -> (u32, u32);
     // Tick the entity (move it, perform collision checks, etc) 
     fn tick(&mut self);
 }