Move some FreeType operations to Font itself, add lazy loading for Glyph data, remove IDisposable from base Resource.

Voile/Source/Resources/Resource.cs

@@ -57,7 +57,7 @@ namespace Voile
     /// <summary>
     /// Represents data usable by Voile.
     /// </summary>
-    public abstract class Resource : IDisposable
+    public abstract class Resource
     {
         /// <summary>
         /// Path to this resource.
@@ -68,9 +68,5 @@ namespace Voile
         {
             Path = path;
         }
-
-        public void Dispose()
-        {
-        }
     }
 }