Controller Replication (#57)

crates/shared/src/utils/mod.rs

@@ -3,6 +3,7 @@ pub mod billboards;
 pub mod commands;
 pub mod explosions;
 pub mod observers;
+pub mod run_conditions;
 pub mod sprite_3d_animation;
 pub mod squish_animation;
 pub mod trail;

crates/shared/src/utils/run_conditions.rs

@@ -0,0 +1,5 @@
+use bevy::ecs::{resource::Resource, system::Res};
+
+pub fn resource_absent<R: Resource>(res: Option<Res<R>>) -> bool {
+    res.is_none()
+}