Online protocol improvements (#1393)

* Chartkey generation

* Simfile filehash generation

* Read filehash on NSCRSG. Add FLU packets and friendlist vectors. Add
getserverversion method. Send chartkey, filehash and rate on start request.

* Use filehash to find the selected song if it is not empty.

* Friendlist update broadcast.

* Send note row size if it's bigger than 1

* Used for chartkey generation

* Define the ReportScore function with numNotes when WITHOUT_NETWORKING is defined

src/Song.h

@@ -188,6 +188,9 @@ public:
 	/** @brief The transliterated artist of the Song, if it exists. */
 	RString m_sArtistTranslit;
 
+	RString m_sFileHash;
+	RString GetFileHash();
+
 	/* If PREFSMAN->m_bShowNative is off, these are the same as GetTranslit*
 	 * below. Otherwise, they return the main titles. */
 	RString GetDisplayMainTitle() const;