options: drop --opt:subopt option names

For all suboptions, "flat" options were available by separating the
parent option and the sub option with ":", e.g. "--rawvideo:w=123". Drop
this syntax and use "-" as separator. This means even suboptions are
available as normal options now, e.g. "--rawvideo-w=123". The old syntax
doesn't work anymore.

Note that this is completely separate from actual suboptions. For
example, "-rawvideo w=123:h=123" still works. (Not that this syntax is
worth supporting, but it's needed anyway, for for other things like vf
and vo suboptions.)

As a consequence of this change, we also have to add new "no-" prefixed
options for flag suboptions, so that "--no-input-default-bindings"
works. ("--input-no-default-bindings" also works as a consequence of
allowing "-input no-default-bindings" - they are handled by the same
underlying option.)

For --input, always use the full syntax in the manpage. There exist
suboptions other than --input (like --tv, --rawvideo, etc.), but since
they might be handled differently in the future, don't touch these yet.

M_OPT_PREFIXED becomes the default, so remove it. As a minor unrelated
cleanup, get rid of M_OPT_MERGE too and use the OPT_SUBSTRUCT() macro in
some places.

Unrelated: remove the duplicated --tv:buffersize option, fix a typo in
changes.rst.

1 files changed, 3 insertions, 3 deletions

diff --git a/DOCS/man/en/input.rst b/DOCS/man/en/input.rst
index 8a9b4f0e42..a0d2ad00c4 100644
--- a/DOCS/man/en/input.rst
+++ b/DOCS/man/en/input.rst
@@ -14,7 +14,7 @@ with shift.
 
 A list of special keys can be obtained with
 
-| **mpv** --input=keylist
+| **mpv** --input-keylist
 
 In general, keys can be combined with ``Shift``, ``Ctrl`` and ``Alt``:
 
@@ -23,7 +23,7 @@ In general, keys can be combined with ``Shift``, ``Ctrl`` and ``Alt``:
 **mpv** can be started in input test mode, which displays key bindings and the
 commands they're bound to on the OSD, instead of running the commands:
 
-| **mpv** --input=test --demuxer=rawvideo --rawvideo=w=1280:h=720 /dev/zero
+| **mpv** --input-test --demuxer=rawvideo --rawvideo=w=1280:h=720 /dev/zero
 
 (Commands which normally close the player will not work in this mode, and you
 must kill **mpv** externally to make it exit.)
@@ -51,7 +51,7 @@ List of input commands
 ignore
     Use this to "block" keys that should be unbound, and do nothing. Useful for
     disabling default bindings, without disabling all bindings with
-    ``--input=default-bindings=no``.
+    ``--no-input-default-bindings``.
 
 seek <seconds> [relative|absolute|absolute-percent|- [default-precise|exact|keyframes]]
     Change the playback position. By default, seeks by a relative amount of