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>

tests/issue_37_test.py

@@ -0,0 +1,84 @@
+#!/usr/bin/env python3
+"""
+Test for Issue #37: Windows scripts subdirectory not checked for .py files
+
+This test checks if the game can find and load scripts/game.py from different working directories.
+On Windows, this often fails because fopen uses relative paths without resolving them.
+"""
+
+import os
+import sys
+import subprocess
+import tempfile
+import shutil
+
+def test_script_loading():
+    # Create a temporary directory to test from
+    with tempfile.TemporaryDirectory() as tmpdir:
+        print(f"Testing from directory: {tmpdir}")
+        
+        # Get the build directory (assuming we're running from the repo root)
+        build_dir = os.path.abspath("build")
+        mcrogueface_exe = os.path.join(build_dir, "mcrogueface")
+        if os.name == "nt":  # Windows
+            mcrogueface_exe += ".exe"
+        
+        # Create a simple test script that the game should load
+        test_script = """
+import mcrfpy
+print("TEST SCRIPT LOADED SUCCESSFULLY")
+mcrfpy.createScene("test_scene")
+"""
+        
+        # Save the original game.py
+        game_py_path = os.path.join(build_dir, "scripts", "game.py")
+        game_py_backup = game_py_path + ".backup"
+        if os.path.exists(game_py_path):
+            shutil.copy(game_py_path, game_py_backup)
+        
+        try:
+            # Replace game.py with our test script
+            os.makedirs(os.path.dirname(game_py_path), exist_ok=True)
+            with open(game_py_path, "w") as f:
+                f.write(test_script)
+            
+            # Test 1: Run from build directory (should work)
+            print("\nTest 1: Running from build directory...")
+            result = subprocess.run(
+                [mcrogueface_exe, "--headless", "-c", "print('Test 1 complete')"],
+                cwd=build_dir,
+                capture_output=True,
+                text=True,
+                timeout=5
+            )
+            if "TEST SCRIPT LOADED SUCCESSFULLY" in result.stdout:
+                print("✓ Test 1 PASSED: Script loaded from build directory")
+            else:
+                print("✗ Test 1 FAILED: Script not loaded from build directory")
+                print(f"stdout: {result.stdout}")
+                print(f"stderr: {result.stderr}")
+            
+            # Test 2: Run from temporary directory (often fails on Windows)
+            print("\nTest 2: Running from different working directory...")
+            result = subprocess.run(
+                [mcrogueface_exe, "--headless", "-c", "print('Test 2 complete')"],
+                cwd=tmpdir,
+                capture_output=True,
+                text=True,
+                timeout=5
+            )
+            if "TEST SCRIPT LOADED SUCCESSFULLY" in result.stdout:
+                print("✓ Test 2 PASSED: Script loaded from different directory")
+            else:
+                print("✗ Test 2 FAILED: Script not loaded from different directory")
+                print(f"stdout: {result.stdout}")
+                print(f"stderr: {result.stderr}")
+                print("\nThis is the bug described in Issue #37!")
+            
+        finally:
+            # Restore original game.py
+            if os.path.exists(game_py_backup):
+                shutil.move(game_py_backup, game_py_path)
+
+if __name__ == "__main__":
+    test_script_loading()