add build target for samples
remove samples/CodeConverter
remove samples/ICSharpCode.Core.Demo
remove samples/NRefactoryDemo (now included in the NRefactory repository)
update samples/CustomPad
update samples/CodonCreation
update samples/CustomView
remove samples/XmlDOM
fix samples/DisplayBindings
fix samples/EmbeddedImageAddIn and samples/HtmlSyntaxColorizer
fix samples/SdaUser and samples/LineCounter
fix samples/ILAsmBinding
fix samples/PInvokeAddIn