Remove unused locale-like code, utf8 functions and headers

source/Irrlicht/Irrlicht.cpp

@@ -127,7 +127,6 @@ namespace irr
 namespace core
 {
 	const matrix4 IdentityMatrix(matrix4::EM4CONST_IDENTITY);
-	irr::core::stringc LOCALE_DECIMAL_POINTS(".");
 }
 
 namespace video