gui, inventory, symmetrical shadowcasting, bugfixes

src/components.rs

@@ -64,3 +64,27 @@ impl SufferDamage {
         }
     }
 }
+
+#[derive(Component, Debug)]
+pub struct Item {}
+
+#[derive(Component, Debug)]
+pub struct Potion {
+    pub heal_amount: i32,
+}
+
+#[derive(Component, Debug, Clone)]
+pub struct InBackpack {
+    pub owner: Entity,
+}
+
+#[derive(Component, Debug, Clone)]
+pub struct WantsToPickupItem {
+    pub collected_by: Entity,
+    pub item: Entity,
+}
+
+#[derive(Component, Debug)]
+pub struct WantsToDrinkPotion {
+    pub potion: Entity,
+}