Fix #423 (Switch from CppDoc to Doxygen), based on patch from anr.

Also delete some unused declarations, and rename is_playing to
snd_is_playing.

This was SVN commit r7813.

source/collada/CommonConvert.h

@@ -66,7 +66,7 @@ private:
 
 /**
  * Standard document loader. Based on FCDocument::LoadFromText, but allows
- * access to <extra> nodes at the document level (i.e. directly in <COLLADA>).
+ * access to \<extra\> nodes at the document level (i.e. directly in \<COLLADA\>).
  */
 class FColladaDocument
 {
@@ -81,7 +81,7 @@ public:
 	/** Returns the FCDocument that was loaded. */
 	FCDocument* GetDocument() const { return document.get(); }
 
-	/** Returns the <extra> data from the <COLLADA> element. */
+	/** Returns the \<extra\> data from the \<COLLADA\> element. */
 	FCDExtra* GetExtra() const { return extra.get(); }
 
 private:

source/collada/StdSkeletons.h

@@ -84,9 +84,11 @@ public:
 	/**
 	 * Initialises the global state with skeleton data loaded from the
 	 * given XML data. Must only be called once.
-	 * (TODO: stop using global state.)
+	 * @todo Stop using global state.
+	 * @param xmlData	 
+	 * @param xmlLength
 	 * @param xmlErrors output - XML parser error messages; will be non-empty
-	 * on failure (and failure will always throw)
+	 *		  on failure (and failure will always throw)
 	 * @throws ColladaException on failure
 	 */
 	static void LoadSkeletonDataFromXml(const char* xmlData, size_t xmlLength, std::string& xmlErrors);