Add alias command

[mwestphal]

Is your feature request related to a problem? Please describe.
F3D support commands that can be inputted using console or command-script.
Add a new command with action alias that takes two arguments so that users can defined their own commands.

Usage: alias action "value"

    action is the action of the command
    value is the command to run, it should be a single token

Add an alias for a command wich is an action action with any arg, and trigger the provided command value

Describe the solution you'd like

• in interactor_impl.cxx add a new command with action alias
• In the alias action, store provided action and value in a map
• In the triggerCommand method, check the alias map

[v0id-strike]

i am working on it

[mwestphal]

#1895

[mwestphal]

Done in #1895