modularize src

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

swingmusic/lib/home/__init__.py

@@ -0,0 +1,30 @@
+from swingmusic.db.userdata import MixTable
+from swingmusic.plugins.mixes import MixesPlugin
+
+
+def find_mix(mixid: str, sourcehash: str):
+    """
+    Find a mix in the homepage store or the db.
+    """
+    from swingmusic.store.homepage import HomepageStore
+
+    mixtype = "custom_mixes" if mixid[0] == "t" else "artist_mixes"
+
+    # INFO: Try getting the mix from the homepage store
+    mix = HomepageStore.get_mix(mixtype, mixid)
+    if mix and mix["sourcehash"] == sourcehash:
+        return mix
+
+    # INFO: Get the mix from the db
+    mix = MixTable.get_by_sourcehash(sourcehash)
+
+    if not mix:
+        return None
+
+    if mixtype == "custom_mixes":
+        mix = MixesPlugin.get_track_mix(mix)
+
+        if not mix:
+            return None
+
+    return mix.to_dict()