modularize src

+ merge main.py and manage.py
+ move start logic to swingmusic/__main__.py
+ add a run.py on the project root

swingmusic/utils/paths.py

@@ -0,0 +1,31 @@
+import os
+import sys
+
+from swingmusic.utils.filesystem import get_home_res_path
+
+
+def getFlaskOpenApiPath():
+    """
+    Used to retrieve the path to the flask_openapi3 package
+
+    See: https://github.com/luolingchun/flask-openapi3/issues/147
+    """
+    site_packages_path = [p for p in sys.path if "site-packages" in p][0]
+
+    return f"{site_packages_path}/flask_openapi3"
+
+
+def getClientFilesExtensions():
+    """
+    Get all the file extensions for the client files
+    """
+
+    client_path = get_home_res_path("client")
+
+    extensions = set()
+    for root, dirs, files in os.walk(client_path):
+        for file in files:
+            ext = file.split(".")[-1]
+            extensions.add("." + ext)
+
+    return extensions