Bevy 0.16 upgrade (#24)

src/movables.rs

@@ -2,8 +2,8 @@ use crate::{
     GameState, global_observer,
     tb_entities::{Movable, MoveTarget},
 };
-use bevy::{prelude::*, utils::HashSet};
-use bevy_trenchbroom::class::Target;
+use bevy::{platform::collections::HashSet, prelude::*};
+use bevy_trenchbroom::prelude::*;
 
 #[derive(Component, Reflect, Default, Debug)]
 #[reflect(Component)]