Added apply methods to some common Vector containers

Added ColourMultiplier vertex modifier.

codechicken/lib/render/ColourMultiplier.java

@@ -0,0 +1,34 @@
+package codechicken.lib.render;
+
+import net.minecraft.client.renderer.Tessellator;
+import codechicken.lib.colour.Colour;
+import codechicken.lib.colour.ColourRGBA;
+import codechicken.lib.vec.Vector3;
+
+public class ColourMultiplier implements IVertexModifier
+{
+    public Colour colour;
+    
+    public ColourMultiplier(Colour colour)
+    {
+        this.colour = colour;
+    }
+    
+    public ColourMultiplier(int colour)
+    {
+        this(new ColourRGBA(colour));
+    }
+    
+    @Override
+    public void applyModifiers(CCModel m, Tessellator tess, Vector3 vec, UV uv, Vector3 normal, int i)
+    {
+        if(CCRenderState.useModelColours() && m != null && m.colours != null)
+            CCRenderState.vertexColour(new ColourRGBA(m.colours[i]).multiply(colour).rgba());
+    }
+
+    @Override
+    public boolean needsNormals()
+    {
+        return false;
+    }
+}