feat: support for "trending" playlists (without authors)

also introduces a fix for text run parsing (by forcing obj to be a dict)

ythdd_inv_tl.py

@@ -904,7 +904,7 @@ def playlists(data, req, only_json: bool = False):
 	# no info about what length can playlists be
 	# settle for a basic sanity check instead
 	# if len(plid) not in (18, 34, 36):
-	if not plid.startswith("PL"):
+	if not (plid.startswith("PL") or plid.startswith("OL")):
 		response = {"error": "Only standard playlists are currently supported (no mixes, video-based playlists, etc.)"}
 		if only_json:
 			return response