feat: add SyncManager for delta asset sync via GitHub Tree API

src/app.py

@@ -13,6 +13,7 @@
 from .datafunctions import cache_skills
 from .downloader import Downloader
 from .imagemanager import ImageManager
+from .syncmanager import SyncManager
 from .iofunc import (
         create_folder, delete_folder_contents, get_asset_path, load_icon, load_json, open_url,
         store_json)
@@ -110,6 +111,12 @@ def __init__(self, theme, args, path, config, versions):
             Path(self.config['config_subfolders']['images']),
             Path(self.config['config_subfolders']['ship_images']),
             self.cargo, self.downloader)
+        self.sync: SyncManager = SyncManager(
+            self.config['config_subfolders']['images'],
+            self.config['config_subfolders']['ship_images'],
+            self.config['config_subfolders']['cargo'],
+            self.config['config_subfolders']['cache'],
+            self.downloader)
         self.app, self.window = self.create_main_window()
         self.cache_icons()
         self.cache_item_aliases()

src/datafunctions.py

@@ -83,6 +83,9 @@ def populate_cache(self, threaded_worker: ThreadObject):
     Parameters:
     - :param threaded_worker: worker object supplying signals
     """
+    threaded_worker.update_splash.emit('Syncing assets…')
+    self.sync.run(on_progress=lambda t, c, n: threaded_worker.update_splash.emit(t))
+
     success = load_cargo_cache(self, threaded_worker)
     if not success:
         self.cache.reset_cache(keep_static_data=True)