Start removing Guitar Mode.

This was rushed in to begin with, and not
worth maintaining for us.

src/NotesLoader.cpp

@@ -7,7 +7,6 @@
 #include "NotesLoaderBMS.h"
 #include "NotesLoaderPMS.h"
 #include "NotesLoaderKSF.h"
-#include "NotesLoaderMidi.h"
 #include "RageUtil.h"
 
 void NotesLoader::GetMainAndSubTitlesFromFullTitle( const RString &sFullTitle, RString &sMainTitleOut, RString &sSubTitleOut )
@@ -61,9 +60,6 @@ bool NotesLoader::LoadFromDir( const RString &sPath, Song &out, set<RString> &Bl
 	KSFLoader::GetApplicableFiles( sPath, list );
 	if( !list.empty() )
 		return KSFLoader::LoadFromDir( sPath, out );
-	MidiLoader::GetApplicableFiles( sPath, list );
-	if( !list.empty() )
-		return MidiLoader::LoadFromDir( sPath, out );
 	return false;
 }