load settings from db, use api to change settings

+ add route to get all settings
+ add route to set any setting
+ add untested migration to add settings into settings db
+ compress json in api responses using FlaskCompress
+ serve gziped assets if browser accepts encoded files
+ misc

app/db/sqlite/queries.py

@@ -26,7 +26,12 @@ CREATE TABLE IF NOT EXISTS settings (
     id integer PRIMARY KEY,
     root_dirs text NOT NULL,
     exclude_dirs text,
-    artist_separators text
+    artist_separators text NOT NULL default '/,;,&',
+    extract_feat integer NOT NULL DEFAULT 1,
+    remove_prod integer NOT NULL DEFAULT 1,
+    clean_album_title integer NOT NULL DEFAULT 1,
+    remove_remaster integer NOT NULL DEFAULT 1,
+    merge_albums integer NOT NULL DEFAULT 0
 );
 
 CREATE TABLE IF NOT EXISTS lastfm_similar_artists (