feat: Add UILine, UICircle, and UIArc drawing primitives

Implement new UIDrawable-derived classes for vector graphics:

- UILine: Thick line segments using sf::ConvexShape for proper thickness
  - Properties: start, end, color, thickness
  - Supports click detection along the line

- UICircle: Filled and outlined circles using sf::CircleShape
  - Properties: radius, center, fill_color, outline_color, outline
  - Full property system for animations

- UIArc: Arc segments for orbital paths and partial circles
  - Properties: center, radius, start_angle, end_angle, color, thickness
  - Uses sf::VertexArray with TriangleStrip for smooth rendering
  - Supports arbitrary angle spans including negative (reverse) arcs

All primitives integrate with the Python API through mcrfpy module:
- Added to PyObjectsEnum for type identification
- Full getter/setter support for all properties
- Added to UICollection for scene management
- Support for visibility, opacity, z_index, name, and click handling

closes #128, closes #129

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/UIDrawable.h

@@ -21,7 +21,10 @@ enum PyObjectsEnum : int
     UIFRAME = 1,
     UICAPTION,
     UISPRITE,
-    UIGRID
+    UIGRID,
+    UILINE,
+    UICIRCLE,
+    UIARC
 };
 
 class UIDrawable