Finally can pick things up, but it's really bad so far. Need a bunch of refactoring in how the collision system works, and make it so collision and maps can have multiple entities in the same square.

gui/overlay_ui.cpp

@@ -1,4 +1,5 @@
 #include "gui/overlay_ui.hpp"
+#include "gui/guecstra.hpp"
 #include "constants.hpp"
 #include "events.hpp"
 #include <optional>
@@ -17,6 +18,13 @@ namespace gui {
 
   void OverlayUI::init() {
     $gui.init();
+    auto bottom = $gui.entity("bottom");
+    $gui.set<Clickable>(bottom, {
+        [&](auto ent, auto data) {
+          $level.world->send<Events::GUI>(
+              Events::GUI::AIM_CLICK, ent, data);
+        }
+    });
   }
 
   void OverlayUI::render(sf::RenderWindow& window) {
@@ -47,4 +55,9 @@ namespace gui {
   void OverlayUI::close_label(string region) {
     $gui.close<Label>(region);
   }
+
+  void OverlayUI::update_level(GameLevel level) {
+    $level = level;
+    // BUG: I think I have to redo the clickable
+  }
 }