Gtk: Update BaseComboBox to use gtk arrow-size style to determine the width of the drop down arrow
iOS: Fix cloning or drawing a portion of an image. Fixes #179
D2d: Use system font size instead of fixed size
Fix compile error
TextureBrushesSection should only draw clip rectangle region instead of entire control for better performance
Make IGraphicsCreate mobile-only for now, until api is finalized (we need to make Bitmaps support dpi)