Tracer::signum function now returns int

convert c style casts to c++ static casts

Changed fabs() to std::abs()

src/SetChunkData.cpp

@@ -103,7 +103,7 @@ void cSetChunkData::CalculateHeightMap(void)
 				int index = cChunkDef::MakeIndexNoCheck(x, y, z);
 				if (m_BlockTypes[index] != E_BLOCK_AIR)
 				{
-					m_HeightMap[x + z * cChunkDef::Width] = (HEIGHTTYPE)y;
+					m_HeightMap[x + z * cChunkDef::Width] = static_cast<HEIGHTTYPE>(y);
 					break;
 				}
 			}  // for y