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/modules/video/theora/Video.h

@@ -0,0 +1,81 @@
+/**
+ * Copyright (c) 2006-2015 LOVE Development Team
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty.  In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software. If you use this software
+ *    in a product, an acknowledgment in the product documentation would be
+ *    appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ **/
+
+#ifndef LOVE_VIDEO_THEORA_VIDEO_H
+#define LOVE_VIDEO_THEORA_VIDEO_H
+
+// STL
+#include <vector>
+
+// LOVE
+#include "filesystem/File.h"
+#include "video/Video.h"
+#include "thread/threads.h"
+#include "VideoStream.h"
+
+namespace love
+{
+namespace video
+{
+namespace theora
+{
+
+class Worker;
+
+class Video : public love::video::Video
+{
+public:
+	Video();
+	~Video();
+
+	// Implements Module
+	virtual const char *getName() const;
+
+	VideoStream *newVideoStream(love::filesystem::File* file);
+
+private:
+	Worker *workerThread;
+}; // Video
+
+class Worker : public love::thread::Threadable
+{
+public:
+	Worker();
+	~Worker();
+
+	// Implements Threadable
+	void threadFunction();
+
+	void addStream(VideoStream *stream);
+	// Frees itself!
+	void stop();
+
+private:
+	std::vector<StrongRef<VideoStream>> streams;
+	love::thread::MutexRef mutex;
+
+	volatile bool stopping;
+}; // Worker
+
+} // theora
+} // video
+} // love
+
+#endif // LOVE_VIDEO_THEORA_VIDEO_H