Add framework for plFormat
Provide implementations of most built-in types (excluding floating point)
Take advantage of some custom formatter shortcuts
Properly handle zero
Add support for bool formatting
Add better documentation, and fix some floating point flag stuff
Oops - bits parameter isn't actually used any more
Provide some sample conversions to plFormat for testing and copying
Merge pull request #420 from zrax/plFormat

plFormat: a type-safe string formatter