A bunch of array fixes and some buffer stuff that doesn't quite work yet

test/buffers.ink

@@ -0,0 +1,11 @@
+property_buffer :: buffer {
+	color : float4;
+}
+
+cbuffer :: constant_buffer {
+	color : float4;
+}
+
+pixel main :: (index : int) {
+	return property_buffer[index].color;
+}