Add Utils.lookupIcon and Gtk.IconInfo.filename (#6)

* Add `Utils.lookupIcon`

* Add `Gtk.IconInfo.filename`

src/AGS/Utils/Icon.js

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+export const lookupIconImpl = Utils.lookUpIcon
+

src/AGS/Utils/Icon.purs

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+module AGS.Utils.Icon (lookupIcon) where
+
+import Prelude
+
+import Data.Maybe (Maybe)
+import Data.Nullable (Nullable, toMaybe)
+import Effect (Effect)
+import Effect.Uncurried (EffectFn2, runEffectFn2)
+import Gtk.IconInfo (GtkIconInfo)
+
+-- | Look up an icon given its name and size.
+lookupIcon ∷ String → Int → Effect (Maybe GtkIconInfo)
+lookupIcon name size = map toMaybe (runEffectFn2 lookupIconImpl name size)
+
+foreign import lookupIconImpl ∷ EffectFn2 String Int (Nullable GtkIconInfo)
+

src/Gtk/IconInfo.js

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+export const getFilenameImpl =
+  iconInfo =>
+    iconInfo.get_filename()
+

src/Gtk/IconInfo.purs

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+module Gtk.IconInfo (GtkIconInfo, filename) where
+
+import Data.Maybe (Maybe)
+import Data.Nullable (Nullable, toMaybe)
+import Prelude ((<<<))
+
+foreign import data GtkIconInfo ∷ Type
+
+-- | Returns the full path to the icon, unless it's a builtin icon.
+filename ∷ GtkIconInfo → Maybe String
+filename = toMaybe <<< getFilenameImpl
+
+foreign import getFilenameImpl ∷ GtkIconInfo → Nullable String
+