Clean up math functions

- Remove checking for standard functions from the build system
- Prefix all invocations with std::
- Replace suffixed functions with unprefixed versions
- Include <cmath> in all files that use it and remove the global include

e.g. floorf(x) -> std::floor(x)

src/TimingData.cpp

@@ -6,7 +6,9 @@
 #include "RageLog.h"
 #include "ThemeManager.h"
 #include "NoteTypes.h"
-#include <float.h>
+
+#include <cfloat>
+#include <cmath>
 
 static void EraseSegment(std::vector<TimingSegment*> &vSegs, int index, TimingSegment *cur);
 static const int INVALID_INDEX = -1;
@@ -414,7 +416,7 @@ int TimingData::GetSegmentIndexAtRow(TimingSegmentType tst, int iRow ) const
 			r = m - 1;
 		}
 	}
-	
+
 	// iRow is before the first segment of type tst
 	return INVALID_INDEX;
 }
@@ -1030,7 +1032,7 @@ void TimingData::ScaleRegion( float fScale, int iStartIndex, int iEndIndex, bool
 	ASSERT( iStartIndex < iEndIndex );
 
 	int length = iEndIndex - iStartIndex;
-	int newLength = lrintf( fScale * length );
+	int newLength = std::lrint( fScale * length );
 
 	FOREACH_TimingSegmentType( tst )
 		for (unsigned j = 0; j < m_avpTimingSegments[tst].size(); j++)
@@ -1435,7 +1437,7 @@ LUA_REGISTER_CLASS( TimingData )
 /*
  * (c) 2001-2004 Chris Danford, Glenn Maynard
  * All rights reserved.
- * 
+ *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the
  * "Software"), to deal in the Software without restriction, including
@@ -1445,7 +1447,7 @@ LUA_REGISTER_CLASS( TimingData )
  * copyright notice(s) and this permission notice appear in all copies of
  * the Software and that both the above copyright notice(s) and this
  * permission notice appear in supporting documentation.
- * 
+ *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF