RSS: fix opacity management

Close #7241
RSS: small cosmetics change
filter_chain: fix potential undefined behavior

If p_chain->first is NULL, we should not take the address of first->filter.
vdpau: fix redundant const qualifier

Was meant as constant pointer and constant pointed data.
es_out: fix potential division by zero
TS mux: start timestamps from 0

Make mplayer timeline display nicer
Use the MKV track width and height when the one in extradata are null

Fix #11387
release-howto: update the mirrors part
Revert "NPAPI-win32: use PKG_CONFIG_LIBDIR to detect libVLC"

This reverts commit 33a939a720d653848465078c7ecf199556f6f99b.
TS demux: remove prototypes
TS demux: call Demux directly
TS demux: use unsigned type for array offset
TS demux: PIDFillFormat doesn't operate on ts_es_t anymore

Fix warning:
initialization discards ‘const’ qualifier from pointer target type
     es_format_t *fmt = &es->fmt;

Introduced in 60044057c53a580482fbe515d86bd5bdaa453dae
TS mux: AAC is not packetized using MP4

Fix f3334ccb2f26fc984779015d37df7ea5b8dd88d0
Keep the selected languages at segment change

Fix #11118
update: use gcrypt enums, they are mapped to the spec already
update: use the digest algo specified in the signature

We already check that it is SHA1
macosx: do not break prefs animation in case of double clicks on toolbar (close #11469)
mac shortcuts: delete default shortcut for wallpaper mode

This shortcut is not supported on the mac, and will not work.
macosx: fix show fs controller hotkey (default i)