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/issue73_simple_index_test.py

@@ -0,0 +1,77 @@
+#!/usr/bin/env python3
+"""
+Simple test for Issue #73: Entity.index() method
+"""
+
+def test_entity_index(timer_name):
+    """Test that Entity.index() method works correctly"""
+    import mcrfpy
+    import sys
+    
+    print("Testing Entity.index() 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)
+    
+    # Clear any existing entities
+    while len(grid.entities) > 0:
+        grid.entities.remove(0)
+    
+    # Create entities
+    entity1 = mcrfpy.Entity((1, 1), texture, 1, grid)
+    entity2 = mcrfpy.Entity((2, 2), texture, 2, grid)
+    entity3 = mcrfpy.Entity((3, 3), texture, 3, grid)
+    
+    grid.entities.append(entity1)
+    grid.entities.append(entity2)
+    grid.entities.append(entity3)
+    
+    print(f"Created {len(grid.entities)} entities")
+    
+    # Test index() method
+    idx1 = entity1.index()
+    idx2 = entity2.index()
+    idx3 = entity3.index()
+    
+    print(f"Entity 1 index: {idx1}")
+    print(f"Entity 2 index: {idx2}")
+    print(f"Entity 3 index: {idx3}")
+    
+    assert idx1 == 0, f"Entity 1 should be at index 0, got {idx1}"
+    assert idx2 == 1, f"Entity 2 should be at index 1, got {idx2}"
+    assert idx3 == 2, f"Entity 3 should be at index 2, got {idx3}"
+    
+    print("✓ All entities report correct indices")
+    
+    # Test removal using index
+    remove_idx = entity2.index()
+    grid.entities.remove(remove_idx)
+    print(f"✓ Removed entity at index {remove_idx}")
+    
+    # Check remaining entities
+    assert len(grid.entities) == 2
+    assert entity1.index() == 0
+    assert entity3.index() == 1  # Should have shifted down
+    
+    print("✓ Indices updated correctly after removal")
+    
+    # Test entity not in grid
+    orphan = mcrfpy.Entity((5, 5), texture, 5, None)
+    try:
+        idx = orphan.index()
+        print(f"✗ Orphan entity should raise error but returned {idx}")
+    except RuntimeError as e:
+        print(f"✓ Orphan entity correctly raises error")
+    
+    print("\n✅ Entity.index() test PASSED")
+    sys.exit(0)
+
+# Execute the test after a short delay
+import mcrfpy
+mcrfpy.setTimer("test", test_entity_index, 100)