Fix some tests and do some cleanup.

test/property_rename.inx

@@ -0,0 +1,11 @@
+props :: properties {
+	color : float4;
+}
+
+vertex main :: (pos : float4 @position) -> float4 @position {
+	return pos;
+}
+
+pixel main :: () -> float4 @target0 {
+	  return props.color;
+}