Add (temporary terrible) volume controls

- Add volume control

   These volume controls are basically nothing more than sliders.  They
   look terrible and hopefully will be as temporary as they are
   terrible.

 - Allow saving of specific non-user sources via obs_load_source and
   obs_save_source functions.

 - Save data of desktop/mic audio sources (sync data, volume data, etc),
   and load the data on startup.

 - Make it so that a scene is created by default if first time using the
   application.  On certain operating systems where supported, a default
   capture will be created.  Desktop capture on mac, particularly.  Not
   sure what to do about windows because monitor capture on windows 7 is
   completely terrible and is bad to start users off with.

libobs/util/windows/ComPtr.hpp

@@ -16,6 +16,9 @@
 
 #pragma once
 
+/* Oh no I have my own com pointer class, the world is ending, how dare you
+ * write your own! */
+
 template<typename T> class ComPtr {
 	T *ptr;
 
@@ -77,6 +80,9 @@ public:
 
 	inline T *Get() const              {return ptr;}
 
+	/* nabbed this one from virtualdub */
+	inline T **operator~()             {return Assign();}
+
 	inline    operator T*() const      {return ptr;}
 	inline T *operator->() const       {return ptr;}