Simplify media i/o interfaces

Completely revamped the entire media i/o data and handlers.  The
original idea was to have a system that would have connecting media
inputs and outputs, but at a certain point I realized that this was an
unnecessary complexity for what we wanted to do.  (Also, it reminded me
of directshow filters, and I HATE directshow with a passion, and
wouldn't wish it upon my greatest enemy)

Now, audio/video outputs are connected to directly, with better callback
handlers, and will eventually have the ability to automatically handle
conversions such as 4:4:4 to 4:2:0 when connecting to an input that uses
them.  Doing this will allow the video/audio i/o handlers to also
prevent duplicate conversion, as well as make it easier/simple to use.

My true goal for this is to make output and encoder plugins as simple to
create as possible.  I want to be able to be able to create an output
plugin with almost no real hassle of having to worry about image
conversions, media inputs/outputs, etc.  A plugin developer shouldn't
have to handle that sort of stuff when he/she doesn't really need to.

Plugins will be able to simply create a callback via obs_video() and/or
obs_audio(), and they will automatically receive the audio/video data in
the formats requested via a simple callback, without needing to do
almost anything else at all.

vs/2013/libobs/libobs.vcxproj

@@ -42,7 +42,6 @@
     <ClInclude Include="..\..\..\libobs\media-io\audio-io.h" />
     <ClInclude Include="..\..\..\libobs\media-io\audio-resampler.h" />
     <ClInclude Include="..\..\..\libobs\media-io\format-conversion.h" />
-    <ClInclude Include="..\..\..\libobs\media-io\media-io.h" />
     <ClInclude Include="..\..\..\libobs\media-io\video-io.h" />
     <ClInclude Include="..\..\..\libobs\obs-data.h" />
     <ClInclude Include="..\..\..\libobs\obs-defs.h" />
@@ -90,7 +89,6 @@
     <ClCompile Include="..\..\..\libobs\media-io\audio-io.c" />
     <ClCompile Include="..\..\..\libobs\media-io\audio-resampler-ffmpeg.c" />
     <ClCompile Include="..\..\..\libobs\media-io\format-conversion.c" />
-    <ClCompile Include="..\..\..\libobs\media-io\media-io.c" />
     <ClCompile Include="..\..\..\libobs\media-io\video-io.c" />
     <ClCompile Include="..\..\..\libobs\obs-display.c" />
     <ClCompile Include="..\..\..\libobs\obs-module.c" />

vs/2013/libobs/libobs.vcxproj.filters

@@ -87,9 +87,6 @@
     <ClInclude Include="..\..\..\libobs\media-io\audio-io.h">
       <Filter>media-io\Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\..\libobs\media-io\media-io.h">
-      <Filter>media-io\Header Files</Filter>
-    </ClInclude>
     <ClInclude Include="..\..\..\libobs\media-io\video-io.h">
       <Filter>media-io\Header Files</Filter>
     </ClInclude>
@@ -227,9 +224,6 @@
     <ClCompile Include="..\..\..\libobs\media-io\audio-io.c">
       <Filter>media-io\Source Files</Filter>
     </ClCompile>
-    <ClCompile Include="..\..\..\libobs\media-io\media-io.c">
-      <Filter>media-io\Source Files</Filter>
-    </ClCompile>
     <ClCompile Include="..\..\..\libobs\util\config-file.c">
       <Filter>util\Source Files</Filter>
     </ClCompile>