generalised item use system

src/components.rs

@@ -70,7 +70,7 @@ impl SufferDamage {
 pub struct Item {}
 
 #[derive(Component, Debug)]
-pub struct Potion {
+pub struct ProvidesHealing {
     pub heal_amount: i32,
 }
 
@@ -91,6 +91,9 @@ pub struct WantsToDropItem {
 }
 
 #[derive(Component, Debug)]
-pub struct WantsToDrinkPotion {
-    pub potion: Entity,
+pub struct WantsToUseItem {
+    pub item: Entity,
 }
+
+#[derive(Component, Debug)]
+pub struct Consumable {}