Create Tools.Dialog for dialog type windows
Add Layout.AddSeparator()
AddonCreator uses Dialog
Tweak styles for dialog
AddonDownload basics
Can create pixmap from http
Fixed assetlist source arg
Automatically resize + cache pixmaps when drawing to a different size
Update AddonCreator, AddonDownload
Redraw active window when pixmap downloaded
Fix interopgen inline scopes
Show from backend oiption in addon manager