Fix critical issues: script loading, entity types, and color properties

- Issue #37: Fix Windows scripts subdirectory not checked
  - Updated executeScript() to use executable_path() from platform.h
  - Scripts now load correctly when working directory differs from executable

- Issue #76: Fix UIEntityCollection returns wrong type
  - Updated UIEntityCollectionIter::next() to check for stored Python object
  - Derived Entity classes now preserve their type when retrieved from collections

- Issue #9: Recreate RenderTexture when resized (already fixed)
  - Confirmed RenderTexture recreation already implemented in set_size() and set_float_member()
  - Uses 1.5x padding and 4096 max size limit

- Issue #79: Fix Color r, g, b, a properties return None
  - Implemented get_member() and set_member() in PyColor.cpp
  - Color component properties now work correctly with proper validation

- Additional fix: Grid.at() method signature
  - Changed from METH_O to METH_VARARGS to accept two arguments

All fixes include comprehensive tests to verify functionality.

closes #37, closes #76, closes #9, closes #79

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

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

.archive/issue27_entity_extend_test.py

@@ -0,0 +1,105 @@
+#!/usr/bin/env python3
+"""
+Test for Issue #27: EntityCollection.extend() method
+
+Verifies that EntityCollection can extend with multiple entities at once.
+"""
+
+def test_entity_extend(timer_name):
+    """Test that EntityCollection.extend() method works correctly"""
+    import mcrfpy
+    import sys
+    
+    print("Issue #27 test: EntityCollection.extend() method")
+    
+    # Create test scene and grid
+    mcrfpy.createScene("test")
+    ui = mcrfpy.sceneUI("test")
+    
+    # Create grid with texture
+    texture = mcrfpy.Texture("assets/kenney_ice.png", 16, 16)
+    grid = mcrfpy.Grid(10, 10, texture, (10, 10), (400, 400))
+    ui.append(grid)
+    
+    # Add some initial entities
+    entity1 = mcrfpy.Entity((1, 1), texture, 1, grid)
+    entity2 = mcrfpy.Entity((2, 2), texture, 2, grid)
+    grid.entities.append(entity1)
+    grid.entities.append(entity2)
+    
+    print(f"✓ Initial entities: {len(grid.entities)}")
+    
+    # Test 1: Extend with a list of entities
+    new_entities = [
+        mcrfpy.Entity((3, 3), texture, 3, grid),
+        mcrfpy.Entity((4, 4), texture, 4, grid),
+        mcrfpy.Entity((5, 5), texture, 5, grid)
+    ]
+    
+    try:
+        grid.entities.extend(new_entities)
+        assert len(grid.entities) == 5, f"Expected 5 entities, got {len(grid.entities)}"
+        print(f"✓ Extended with list: now {len(grid.entities)} entities")
+    except Exception as e:
+        print(f"✗ Failed to extend with list: {e}")
+        raise
+    
+    # Test 2: Extend with a tuple
+    more_entities = (
+        mcrfpy.Entity((6, 6), texture, 6, grid),
+        mcrfpy.Entity((7, 7), texture, 7, grid)
+    )
+    
+    try:
+        grid.entities.extend(more_entities)
+        assert len(grid.entities) == 7, f"Expected 7 entities, got {len(grid.entities)}"
+        print(f"✓ Extended with tuple: now {len(grid.entities)} entities")
+    except Exception as e:
+        print(f"✗ Failed to extend with tuple: {e}")
+        raise
+    
+    # Test 3: Extend with generator expression
+    try:
+        grid.entities.extend(mcrfpy.Entity((8, i), texture, 8+i, grid) for i in range(3))
+        assert len(grid.entities) == 10, f"Expected 10 entities, got {len(grid.entities)}"
+        print(f"✓ Extended with generator: now {len(grid.entities)} entities")
+    except Exception as e:
+        print(f"✗ Failed to extend with generator: {e}")
+        raise
+    
+    # Test 4: Verify all entities have correct grid association
+    for i, entity in enumerate(grid.entities):
+        # Just checking that we can iterate and access them
+        assert entity.sprite_number >= 1, f"Entity {i} has invalid sprite number"
+    print("✓ All entities accessible and valid")
+    
+    # Test 5: Invalid input - non-iterable
+    try:
+        grid.entities.extend(42)
+        print("✗ Should have raised TypeError for non-iterable")
+    except TypeError as e:
+        print(f"✓ Correctly rejected non-iterable: {e}")
+    
+    # Test 6: Invalid input - iterable with non-Entity
+    try:
+        grid.entities.extend([entity1, "not an entity", entity2])
+        print("✗ Should have raised TypeError for non-Entity in iterable")
+    except TypeError as e:
+        print(f"✓ Correctly rejected non-Entity in iterable: {e}")
+    
+    # Test 7: Empty iterable (should work)
+    initial_count = len(grid.entities)
+    try:
+        grid.entities.extend([])
+        assert len(grid.entities) == initial_count, "Empty extend changed count"
+        print("✓ Empty extend works correctly")
+    except Exception as e:
+        print(f"✗ Empty extend failed: {e}")
+        raise
+    
+    print(f"\n✅ Issue #27 test PASSED - EntityCollection.extend() works correctly")
+    sys.exit(0)
+
+# Execute the test after a short delay
+import mcrfpy
+mcrfpy.setTimer("test", test_entity_extend, 100)