Incorporate the systems registry to make it easier to add/remove systems.

src/gui/fsm.cpp

@@ -27,6 +27,8 @@ namespace gui {
       $window.setVerticalSyncEnabled(VSYNC);
       if(FRAME_LIMIT) $window.setFramerateLimit(FRAME_LIMIT);
       $window.setPosition({0,0});
+      // BUG: I don't like this here
+      System::init($systems);
     }
 
   void FSM::event(Event ev, std::any data) {
@@ -67,7 +69,7 @@ namespace gui {
   void FSM::MOVING(Event ) {
     // this should be an optional that returns a point
     if(auto move_to = $main_ui.play_move()) {
-      System::move_player(*move_to);
+      $systems.runMoving(*move_to);
       run_systems();
       $main_ui.dirty();
       state(State::IDLE);
@@ -79,7 +81,7 @@ namespace gui {
     switch(ev) {
       case TICK: {
         dbc::log("!!!!!! FIX System::combat(0) doesn't use any weapons, only first");
-        System::combat(0);
+        $systems.runCombat(0);
         run_systems();
         state(State::IN_COMBAT);
        } break;
@@ -88,7 +90,7 @@ namespace gui {
         break;
       case ATTACK: {
         int attack_id = std::any_cast<int>(data);
-        System::combat(attack_id);
+        $systems.runCombat(attack_id);
         run_systems();
        } break;
       default:
@@ -193,7 +195,7 @@ namespace gui {
         auto gui_id = std::any_cast<guecs::Entity>(data);
         auto& slot_name = $status_ui.$gui.name_for(gui_id);
 
-        System::use_item(slot_name);
+        $systems.runUseItem(slot_name);
         $status_ui.update();
        } break;
       case MOUSE_CLICK:
@@ -203,7 +205,7 @@ namespace gui {
           mouse_action({1 << guecs::ModBit::hover});
        } break;
       case AIM_CLICK:
-        System::pickup();
+        $systems.runPickup();
         break;
       default:
         break; // ignore everything else
@@ -418,7 +420,7 @@ namespace gui {
       $boss_scene->render($window);
     } else {
       // this clears any attack animations, like fire
-      System::clear_attack();
+      $systems.runRender();
       // BUG: this is the render for this class, and where I add an update
       draw_gui();
     }
@@ -427,13 +429,7 @@ namespace gui {
   }
 
   void FSM::run_systems() {
-    System::generate_paths();
-    System::enemy_ai_initialize();
-    System::enemy_pathing();
-    System::motion();
-    System::collision();
-    System::lighting();
-    System::death();
+    $systems.runUpdate();
   }
 
   bool FSM::active() {