Implement manipulated input blocking

[franckgaga]

Raising an issue to explicitly list the planned features at the same place.

The control horizon argument Hc would be a Vector{Int} instead of an Int, and $\mathbf{\Delta U}$ vector would contains length(Hc)*nu elements.

discussion here: #127

[franckgaga]

@caxelrud still interested in this feature ?

[caxelrud]

Yes indeed. It will make this solution quite complete.

[franckgaga]

Alright i'll give it a try in the next weeks!