Make possible to use Pango::AttrList and Pango::Attributes.

src/bindings/pango/attribute.cr

@@ -0,0 +1,20 @@
+module Pango
+  class Attribute
+    def initialize(pointer : Pointer(Void), transfer : GICrystal::Transfer)
+      raise ArgumentError.new("Tried to generate struct with a NULL pointer") if pointer.null?
+
+      @pointer = if transfer.none?
+                   LibPango.pango_attribute_copy(pointer)
+                 else
+                   pointer
+                 end
+    end
+
+    def finalize
+      {% if flag?(:debugmemory) %}
+        LibC.printf("~%s at %p\n", self.class.name.to_unsafe, self)
+      {% end %}
+      LibPango.pango_attribute_destroy(to_unsafe)
+    end
+  end
+end

src/bindings/pango/binding.yml

@@ -1,10 +1,22 @@
 namespace: Pango
 version: "1.0"
 require_after:
+- attribute.cr
 - font_metrics.cr
 - layout.cr
 
 types:
+  Attribute:
+    binding_strategy: heap_wrapper_struct
+    ignore_fields:
+    - klass
+    ignore_methods:
+    - init
+    - destroy
+  AttrList:
+    ignore_methods:
+    - ref
+    - unref
   FontMetrics:
     binding_strategy: heap_wrapper_struct
     ignore_methods:

src/bindings/pango/font_metrics.cr

@@ -8,6 +8,9 @@ module Pango
     end
 
     def finalize
+      {% if flag?(:debugmemory) %}
+        LibC.printf("~%s at %p - ref count: %d\n", self.class.name.to_unsafe, self, ref_count)
+      {% end %}
       LibPango.pango_font_metrics_unref(to_unsafe)
     end
   end