Use nullptr instead of 0 or NULL to initialize a null pointer. In some
cases, readability was enhanced by replacing 0 with more meaningful
values according to the type of the pointer being initialized.
* Fixed database not showing modified after failed save
* Fixed Yubikey not being redetected after replug
* Fixed single shot challenge resulting in failed saves
* Use compile time detection of the YubiKey libraries and link against
the libraries if present. Can be disabled with:
$ cmake -DCMAKE_DISABLE_FIND_PACKAGE_YubiKey=FALSE
* A stub file provides empty calls for all the function calls integrated
in to the UI to support this. In the future a more modular approach
maybe better, but opting for simplicity initially.
Signed-off-by: Kyle Manna <kyle@kylemanna.com>
