'Up' / 'Down' key for next / previous commands

[Mikolaj Filar]

Pressing up or down arrow shall cause printing next or previous command.

It requires extra buffer, so:

• number of commands shall be configured

• each command shall be stored in allocated space (to avoid storing more characters it's needed)

Hint(?): use list

[Patryk Kubiak]

already implemented

[Patryk Kubiak]

Removing component: chell (automated comment)