Move item collision handling into event handler

This prevents item being picked without any move. Without this change, it was
sufficient to place the player within boxarea and just wait for new boxes to
arrive.

src/main.rs

@@ -61,8 +61,6 @@ fn main() {
             world.update_box_areas();
         }
 
-        world.handle_collisions();
-
         world.render(&mut canvas, &texture, &font);
 
         ::std::thread::sleep(Duration::from_millis(25));

src/world.rs

@@ -112,6 +112,8 @@ impl World {
             Event::KeyUp { .. } => self.execute_command(Command::StopPlayer(player_id)),
             _ => {}
         }
+
+        self.handle_item_collisions();
     }
 
     fn if_collides_execute(&mut self, commands: Vec<Command>) {
@@ -187,7 +189,7 @@ impl World {
     }
 
     /// Handles both, collisions with lounge and any box area
-    pub fn handle_collisions(&mut self) {
+    pub fn handle_item_collisions(&mut self) {
         self.handle_lounge_collisions();
         self.handle_boxarea_collisions();
     }