Implement more of the smart attachment strategy in SmartAttachmentStrategy, namely the special text/* handling found in ObjectTreeParser::processTextPlainSubtype()
Implement more of the smart attachment strategy in SmartAttachmentStrategy, namely the special text/* handling found in ObjectTreeParser::processTextPlainSubtype()

svn path=/trunk/kdepim/; revision=255324

lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi