Add initial video playback support for Ogg Theora videos (resolves issue #66.)

The basic APIs are:

video = love.graphics.newVideo("myvideo.ogv")

love.graphics.draw(video, ...) -- Video objects are Drawables.

video:play(), video:pause()

video:getDuration(), video:tell(), video:rewind(), video:seek(seconds)

video:getSource()

video:getWidth(), video:getHeight(), video:setFilter(min, mag)

More advanced APIs include video:setSource(source), video:getStream(), and videostream:setSync.

To use a custom pixel shader when drawing a Video, call the new TexelVideo(texcoords) function instead of Texel(texture, texcoords) in order to get the pixel colors of a video frame.

src/common/types.h

@@ -34,6 +34,7 @@ enum Type
 	OBJECT_ID,
 	DATA_ID,
 	MODULE_ID,
+	STREAM_ID,
 
 	// Filesystem.
 	FILESYSTEM_FILE_ID,
@@ -56,6 +57,7 @@ enum Type
 	GRAPHICS_SHADER_ID,
 	GRAPHICS_MESH_ID,
 	GRAPHICS_TEXT_ID,
+	GRAPHICS_VIDEO_ID,
 
 	// Image
 	IMAGE_IMAGE_DATA_ID,
@@ -106,6 +108,9 @@ enum Type
 	THREAD_THREAD_ID,
 	THREAD_CHANNEL_ID,
 
+	// Video
+	VIDEO_VIDEO_STREAM_ID,
+
 	// The modules themselves. Only add abstracted modules here.
 	MODULE_FILESYSTEM_ID,
 	MODULE_GRAPHICS_ID,