Vendor metadata needs protection for control characters

[intvsteve]

Although issue #257 mentions that Vendor (publisher) metadata will be fixed as part of a deeper change, it is presently directly exposed on the ProgramDescription class.

Ergo: Apply same fix for Vendor on ProgramDesription as for Name and ShortName.

[intvsteve]

This reminds me … It may be worth the effort to explore retiring ProgramDescription as a public class and instead only work via the interface IProgramDescription. This could act as a stepping stone to moving to IProgramRomInformation. The notion is that the current strategy of using XML Attributes is merely a patch.

Now that issues like this have been identified, moving away from the expediency of the automagical XML serialization services to something more targeted specifically for serialization may make more sense.

[intvsteve]

Fixed in commit cb0a5aa