Revert "Light Calculation using JDK Incubator Vector": Vectorising

yields poorer performance

This reverts commit b47549d846.

src/net/torvald/terrarum/blockproperties/BlockPropUtil.kt

@@ -137,6 +137,11 @@ object BlockPropUtil {
      * @return processed colour
      */
     private fun alterBrightnessUniform(data: Cvec, brighten: Float): Cvec {
-        return Cvec(data.vec.add(brighten))
+        return Cvec(
+                data.r + brighten,
+                data.g + brighten,
+                data.b + brighten,
+                data.a + brighten
+        )
     }
 }