better network structure

app/src/main/java/gui/menu/StateMachine.java

@@ -27,7 +27,7 @@ public class StateMachine {
 	}
 
 	public void popState() {
-		menus.getLast().onKill();
+		menus.get(menus.size() - 1).onKill();
 		menus.pop();
 	}
 
@@ -43,7 +43,7 @@ public class StateMachine {
 		ImGui.setNextWindowSize(displaySize);
 		ImGui.begin("##Main Window", null, ImGuiWindowFlags.NoDecoration | ImGuiWindowFlags.NoMove
 				| ImGuiWindowFlags.NoSavedSettings | ImGuiWindowFlags.NoBackground);
-		menus.getLast().render();
+		menus.get(menus.size() - 1).render();
 		ImGui.end();
 		checkEscape();
 	}