cocoa: fix deadlock during initialization

Thanks to @wm4 for catching the bug.

Fixes #405
build: bump libmpg123 version

The minimum required version was bumped in the old configure script, but
for the waf build system is was somehow forgotten or overlooked.
Probably happened while the waf build system was developed in a separate
branch.

Closes #546.
player: select subtitles added with sub_add

In particular, this affects drag & drop of subtitles, which uses sub_add
internally. This will make the subtitles show up immediately, instead of
requiring manual selection of the added subtitle.

Might be not so ideal when adding multiple subtitles at once, because
that leads to multiple sub_add commands, and will end up with the last
subtitle instead of the first selected. But this is a minor detail.
cocoa: fix deadlock during initialization [2]

Fixup commit for 20fa191ad.
build: disable clang's tautological compare warnings

This silences two non issues in the client.c file. Fixing them as clang would
want us to, would introduce security bugs and potential crashes.
sub: handle vobsub-in-mp4

The mplayer decoder (spudec.c) actually handled this. There was explicit
code for binary palettes (16 32 bit values), and the subtitle resolution
was handled by video resolution coincidentally matching the subtitle
resolution.

Whoever puts vobsub into mp4 should be punished.

Fixes the sample gundam_sample.mp4, closes github issue #547.
build: disable clang's tautological compare warnings [2]

Fixup 8009646583d523fc0.
build: Add -U__STRICT_ANSI__ to CFLAGS on Cygwin

Cygwin's libc (newlib) doesn't obey a lot of unix feature test macros,
including _GNU_SOURCE; as a result, a lot of functions and defines get
masked out -- important defines such as M_PI and strcasecmp. Work around
it by undefining __STRICT_ANSI__ on cygwin systems.

This will still cause compilation issues on any non-cygwin system that
uses newlib, but hopefully nobody does that, or if they do, they will
find this commit message and know to add -U__STRICT_ANSI__ to their
CFLAGS. Hopefully.
lua: make register_event() not overwrite previous event handler

Instead, chain them.

Note that there's no logic to prevent the other event handlers to be run
from an event handler (like it's popular in GUI toolkits), because I
think that's not very useful for this purpose.
lua: auto-load scripts from ~/.mpv/lua/

This is like passing them to --lua.
options: make --no-config block all auto-loaded configuration files

Until now, the --no-config was explicitly checked in multiple places to
suppress loading of config files.

Add such a check to the config path code itself, and refuse to resolve
_any_ configuration file locations if the option is set.

osc.lua needs a small fixup, because it didn't handle the situation when
no path was returned. There may some of such cases in the C code too,
but I didn't find any on a quick look.
sd_lavc: handle subtitles with no subtitle resolution set

Set subtitle resolution to video resolution when avctx->width and
avctx->height are zero.

This can happen with broken vobsubs that have no size set in their
.idx file (or Matroska extradata). At least with the test file provided
in issue #551, using the video resolution as fallback instead of what
guess_resolution() does is better.

Note that these files clearly are broken. It seems this particular
file was created by trying to use ffmpeg to transcode DVB subtitles
to vobsub, and ffmpeg "forgot" to set the subtitle resolution in the
destination file. On the other hand, ffmpeg DVB and PGS decoders set
the resolution on the first subtitle packet (or somewhere close), so
it's not really clear what to do here.

Closes #551.

Signed-off-by: wm4 <wm4@nowhere>

Patch by xylosper, rewritten commit message by wm4.
crosscompile-mingw: improve instructions for MXE
win32: restore support for exe directory as config directory

Same rationale as b2c2fe7a but updated to work with path-win.c

Signed-off-by: wm4 <wm4@nowhere>

Merges/closes #543.
Parse::Matroska::Reader: get rid of `bigrat`

It seems that it was causing issues with certain perl setups (such as
the one on issue #549). It also turns out that it was not behaving correctly
(not all constants were being promoted to big nums as they should), so we
use explicit objects to derive the constants.

There were also precedence issues. I wonder if this even worked right to
begin with.

The 'double' path (8-byte floats) is untested, as I couldn't easily find
a file with such a field.

Closes #549.
Merge branch 'master' of git://github.com/mpv-player/mpv

* 'master' of git://github.com/mpv-player/mpv:
  win32: restore support for exe directory as config directory
  crosscompile-mingw: improve instructions for MXE
  sd_lavc: handle subtitles with no subtitle resolution set
  options: make --no-config block all auto-loaded configuration files
  lua: auto-load scripts from ~/.mpv/lua/
  lua: make register_event() not overwrite previous event handler
csputils: provide string descriptions of chroma locations
m_property: add a sub-property mechanism

This adds a mechanism for easier export of sub-properties. The following
commits will make use of it to export fine grained information about
certain things. The sub-property mechanism reduces the amount of code
needed to export a data value to 1 line.
command: export more video params as properties

This uses the previously added sub-property mechanism to export a bunch
of stuff. For example, "video-params/w" now contains the video width.
demux: expose stream_type_name() function