KVReader + Minor fixes

* Added KVReader class for VDF read/writes.
* Corrected function spelling.
* Corrected Linux param name in ISteamApps::GetAppData.
KVReader: Fixing for FALSE values

When a value is FALSE, nothing was returned. Now it will report `0`,
instead of blank.
Examples pre-processing!

* Examples for ISteamApps::GetAppData are now auto-converted to JSON &
VDF.
 - XML is goign to take me some more time to get working.