Refactor Renderer access and improve gesture handling in iOS and test files

- Replaced instances of Renderer::GetInstance() with Renderer::Get() for consistency across the codebase.
- Enhanced gesture handling in iOS by adding mouse position events for touch gestures.
- Streamlined test initialization for ImGui to align with recent renderer access changes.

test/test_editor.cc

@@ -64,8 +64,8 @@ int RunIntegrationTest() {
 
   // Initialize ImGui for SDL
   ImGui_ImplSDL2_InitForSDLRenderer(
-      controller.window(), yaze::core::Renderer::GetInstance().renderer());
-  ImGui_ImplSDLRenderer2_Init(yaze::core::Renderer::GetInstance().renderer());
+      controller.window(), yaze::core::Renderer::Get().renderer());
+  ImGui_ImplSDLRenderer2_Init(yaze::core::Renderer::Get().renderer());
 
   yaze::test::TestEditor test_editor;
   test_editor.RegisterTests(engine);

test/test_editor.h

@@ -12,9 +12,7 @@ class TestEditor : public yaze::editor::Editor {
  public:
   TestEditor() = default;
   ~TestEditor() = default;
-  void Initialize() override {
-
-  }
+  void Initialize() override {}
 
   absl::Status Cut() override {
     return absl::UnimplementedError("Not implemented");