#664 TinyXml component of changes in #662

[Alexander Riccio]

I need to confess a few sins (I'm not even religious) I edited the TinyXml sources. Yes, I know, editing library files is heresy - but it pays off. The static analysis benefits are just too great!

• I annotated the crap out of far too many files to mention
• I added override and final in many places
• I added const everywhere
• I swapped all the dangerous functions with their bounds-checking counterparts

TinyXml is actually a great example of what SAL is capable of - as an API, SAL can diagnose many different kinds of misuse, that a pure static analyzer never could.