[Style] Added LockedDifficulty() Lua binding.

Docs/Changelog_sm5.txt

@@ -5,9 +5,13 @@ from StepMania 4 alpha 5 to sm-ssc v1.2.5, see Changelog_sm-ssc.txt.
 ________________________________________________________________________________
 
 ================================================================================
-StepMania 5.0 alpha 1a | 2012021?
+StepMania 5.0 alpha 1a | 20120219
 --------------------------------------------------------------------------------
 
+2012/02/19
+----------
+* [Style] Added LockedDifficulty() Lua binding.
+
 2012/02/15
 ----------
 * [HighScore] Added Max Combo, Stage Award and Peak Award. New Lua bindings for

src/Style.cpp

@@ -124,6 +124,7 @@ public:
 	DEFINE_METHOD( GetStepsType,		m_StepsType )
 	DEFINE_METHOD( ColumnsPerPlayer,	m_iColsPerPlayer )
 	DEFINE_METHOD( NeedsZoomOutWith2Players,	m_bNeedsZoomOutWith2Players )
+	DEFINE_METHOD( LockedDifficulty,	m_bLockDifficulties )
 
 	LunaStyle()
 	{
@@ -132,6 +133,7 @@ public:
 		ADD_METHOD( GetStepsType );
 		ADD_METHOD( ColumnsPerPlayer );
 		ADD_METHOD( NeedsZoomOutWith2Players );
+		ADD_METHOD( LockedDifficulty );
 	}
 };