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/embed_lua.py

@@ -27,7 +27,17 @@ def embed_files(output_file, input_files):
                 data = inf.read()
             
             var_name = sanitize_name(input_file)
-            f.write(f'/* Embedded file: {input_file} */\n')
+            # Get relative path for better module loading
+            # Try to extract path relative to common directories
+            relative_name = input_file
+            for prefix in ['build/', 'build\\']:
+                if prefix in input_file:
+                    parts = input_file.split(prefix, 1)
+                    if len(parts) > 1:
+                        relative_name = parts[1]
+                        break
+            
+            f.write(f'/* Embedded file: {relative_name} */\n')
             f.write(f'static const unsigned char embedded_lua_{idx}_{var_name}[] = {{\n')
             
             for i, byte in enumerate(data):
@@ -55,18 +65,32 @@ def embed_files(output_file, input_files):
         f.write('static const EmbeddedLuaFile embedded_lua_files[] = {\n')
         for idx, input_file in enumerate(input_files):
             var_name = sanitize_name(input_file)
-            # Store both original filename and basename for require compatibility
-            basename = os.path.basename(input_file)
-            f.write(f'    {{ "{basename}", embedded_lua_{idx}_{var_name}, embedded_lua_{idx}_{var_name}_len }},\n')
+            # Store relative path for proper require() support
+            relative_name = input_file
+            for prefix in ['build/', 'build\\']:
+                if prefix in input_file:
+                    parts = input_file.split(prefix, 1)
+                    if len(parts) > 1:
+                        relative_name = parts[1]
+                        break
+            # Normalize path separators
+            relative_name = relative_name.replace('\\', '/')
+            f.write(f'    {{ "{relative_name}", embedded_lua_{idx}_{var_name}, embedded_lua_{idx}_{var_name}_len }},\n')
         f.write('};\n\n')
         
         f.write(f'static const int embedded_lua_file_count = {len(input_files)};\n\n')
         
-        # Main entry point (first file)
-        var_name = sanitize_name(input_files[0])
+        # Main entry point (first file with 'main.lua' in name, or first file)
+        main_idx = 0
+        for idx, input_file in enumerate(input_files):
+            if 'main.lua' in input_file.lower():
+                main_idx = idx
+                break
+        
+        var_name = sanitize_name(input_files[main_idx])
         f.write('/* Main entry point */\n')
-        f.write(f'#define embedded_main_lua embedded_lua_0_{var_name}\n')
-        f.write(f'#define embedded_main_lua_len embedded_lua_0_{var_name}_len\n\n')
+        f.write(f'#define embedded_main_lua embedded_lua_{main_idx}_{var_name}\n')
+        f.write(f'#define embedded_main_lua_len embedded_lua_{main_idx}_{var_name}_len\n\n')
         
         f.write('#endif /* EMBEDDED_MAIN_H */\n')