Add test for wai command

[wargio]

The command wai <instructions1> <instructions2> ... which should assemble instruction(s) and write bytes inside the current instruction boundaries is not tested within test/db/

This instruction also is not mapped on the book.

What the command does is tring to fit a new instruction within the boundaries of the old one.

for example in x86 changing a long instruction like lea which may use 8 bytes with a mov which uses 4, will be automatically handled like lea .... to mov ... ; nop ; nop ; nop ; nop

so the command usage is the same as wa with the exception that you do not have to care about the boundaries of the instruction that you are overwriting