rg caching, improved display

src/sh/api.sh

@@ -1,3 +1,6 @@
+MB_BROWSE_STEPS=100
+export MB_BROWSE_STEPS
+
 # Argument: MB Artist ID
 __api_mb_browse_releases() {
   $CURL \
@@ -14,7 +17,7 @@ __api_mb_browse_release_groups() {
   $CURL \
     --get \
     --data fmt=json \
-    --data limit=100 \
+    --data limit="$MB_BROWSE_STEPS" \
     --data offset="${2:-0}" \
     --data-urlencode artist="$1" \
     -A "$APP_NAME/$APP_VERSION ($APP_WEBSITE)" \