Add flexible module loading and complete file embedding

- Support any folder structure (no hard-coded folders)
 - Embed all file types recursively from any folder
 - Fix require() dot-to-slash conversion for embedded modules
 - Clean build folder for fresh builds every time
 - Generate empty headers for Lua-only projects

 Backward compatible with existing projects.

scripts/create_empty_assets.py

@@ -0,0 +1,24 @@
+#!/usr/bin/env python3
+"""
+Create an empty embedded_assets.h file for compatibility.
+Usage: python create_empty_assets.py <output.h>
+"""
+import sys
+
+if __name__ == '__main__':
+    if len(sys.argv) < 2:
+        print('Usage: python create_empty_assets.py <output.h>')
+        sys.exit(1)
+    
+    output_file = sys.argv[1]
+    
+    with open(output_file, 'w') as f:
+        f.write('#ifndef EMBEDDED_ASSETS_H\n')
+        f.write('#define EMBEDDED_ASSETS_H\n')
+        f.write('/* No assets to embed */\n')
+        f.write('typedef struct { const char* name; const unsigned char* data; unsigned int size; } EmbeddedAsset;\n')
+        f.write('static const EmbeddedAsset embedded_assets[] = {};\n')
+        f.write('static const int embedded_asset_count = 0;\n')
+        f.write('#endif\n')
+    
+    print(f'Created empty {output_file}')