* Add 1st initial version of WishBone checker unit
* Add Wishbone package with component & type declarations
* Replace WB slave register by dictionary

Instead of using directed tests we switch to coverage driven ones
by using OSVVM capabilities.

A new stack implementation is added. It's a protected type t_stack,
included in the StackP package. It has the same methods like the
t_queue types but implements a stack logic instead of a queue one.
The t_stack type is tested in the StackT testbench.

Various new PSL assertions to check ports during Wishbone write & read
transfer and reset state