Added the LoopOnChartEnd metric for the editor.

Let the players decide whether to loop or not
when playing charts in the editor.

src/ScreenEdit.cpp

@@ -701,6 +701,8 @@ static Preference1D<RString> EDITOR_NOTE_SKINS( SetDefaultEditorNoteSkin, NUM_PL
 
 static ThemeMetric<RString> EDIT_MODIFIERS		("ScreenEdit","EditModifiers");
 
+static ThemeMetric<bool> LOOP_ON_CHART_END		("ScreenEdit","LoopOnChartEnd");
+
 REGISTER_SCREEN_CLASS( ScreenEdit );
 
 void ScreenEdit::Init()
@@ -1017,8 +1019,7 @@ void ScreenEdit::Update( float fDeltaTime )
 		float fStopAtSeconds = m_pSteps->m_Timing.GetElapsedTimeFromBeat( NoteRowToBeat(m_iStopPlayingAt) ) + 1;
 		if( GAMESTATE->m_pPlayerState[PLAYER_1]->m_Position.m_fMusicSeconds > fStopAtSeconds )
 		{
-			// loop
-			TransitionEditState( STATE_PLAYING );
+			TransitionEditState( ( LOOP_ON_CHART_END ? STATE_PLAYING : STATE_EDITING ) );
 		}
 	}