[Yapsi] adapted to Tardis
[Yapsi] adapted to Tardis

This meant adding back the .tick method calls, as well as exposing the
$.current-lexpad as an attribute, so that the .pick method in the deriving
Tardis::Debugger class can see it. (It could see a private $!current-lexpad
too, but that's a deficiency in Rakudo, that shouldn't be exploited.)

andreoss/yapsi,masak/yapsi