show artist decade in genres

+ assign default artist separators if db is empty
+ add instrumental to album version
+ check if album is a single by checking og_title and current title
+ hard code juice wrld artist name in model
+ set album aritst to first artist if track has no album artist
+ rewrite get_base_album_title regex to use existing album versions
+ misc

app/enums/album_versions.py

@@ -29,6 +29,7 @@ class AlbumVersionEnum(Enum):
     ARCHIVE_EDITION = ("archive",)
 
     Acoustic = ("acoustic",)
+    instrumental = ("instrumental",)
     DOUBLE_DISC = ("double disc", "double disk")
 
     SUMMER_EDITION = ("summer",)
@@ -56,3 +57,7 @@ class AlbumVersionEnum(Enum):
     REISSUE = ("reissue",)
     REMASTERED = ("remaster",)
     TAYLORS_VERSION = ("taylor's version",)
+
+
+def get_all_keywords():
+    return "|".join("|".join(i.value) for i in AlbumVersionEnum)