refactor: re-layput project

- move assets (raw jsons, icons, meshes and i18n data) into the root of repo.
- move script into the root of repo.
- modify blender manifest according to this changes.
- optimize gitignore.

scripts/build_icons.py

@@ -0,0 +1,51 @@
+import logging
+from pathlib import Path
+import common
+import PIL, PIL.Image
+
+# the config for thumbnail
+THUMBNAIL_SIZE: int = 16
+
+class ThumbnailBuilder():
+
+    def __init__(self):
+        pass
+
+    def build_thumbnails(self) -> None:
+        # get folder path
+        root_folder = common.get_plugin_folder()
+
+        # prepare handler
+        def folder_handler(rel_name: str, src_folder: Path, dst_folder: Path) -> None:
+            # just create folder
+            logging.info(f'Creating Folder: {src_folder} -> {dst_folder}')
+            dst_folder.mkdir(parents=False, exist_ok=True)
+        def file_handler(rel_name: str, src_file: Path, dst_file: Path) -> None:
+            # skip non-image
+            if src_file.suffix != '.png': return
+            # call thumbnail func
+            logging.info(f'Building Thumbnail: {src_file} -> {dst_file}')
+            self.__resize_image(src_file, dst_file)
+
+        # call common processor
+        common.common_file_migrator(
+            root_folder / 'raw_icons',
+            root_folder / 'icons',
+            folder_handler,
+            file_handler
+        )
+
+        logging.info('Building thumbnail done.')
+
+    def __resize_image(self, src_file: Path, dst_file: Path) -> None:
+        # open image
+        src_image: PIL.Image.Image = PIL.Image.open(src_file)
+        # create thumbnail
+        src_image.thumbnail((THUMBNAIL_SIZE, THUMBNAIL_SIZE))
+        # save to new file
+        src_image.save(dst_file)
+
+if __name__ == '__main__':
+    common.setup_logging()
+    thumbnail_builder = ThumbnailBuilder()
+    thumbnail_builder.build_thumbnails()