Merge branch 'v0.21.x'

NEWS

@@ -43,15 +43,24 @@ ver 0.22 (not yet released)
 ver 0.21.25 (not yet released)
 * protocol:
   - fix crash when using "rangeid" while playing
+* database
+  - simple: automatically scan new mounts
+* storage
+  - fix disappearing mounts after mounting twice
+  - udisks: fix reading ".mpdignore"
 * input
   - file: detect premature end of file
   - smbclient: don't send credentials to MPD clients
 * decoder
   - opus: apply pre-skip and end trimming
   - opus: fix memory leak
+  - opus: fix crash bug
+  - vorbis: fix crash bug
 * output
   - osx: improve sample rate selection
   - osx: fix noise while stopping
+* neighbor
+  - upnp: fix crash during shutdown
 * Windows/Android:
   - fix Boost detection after breaking change in Meson 0.54