Rudder

We currently have no multi instance technique with mono and multi valued variables.
It should be possible and useful (for example to have a common parameter for a directive but not for the whole technique).

Currently, mono instance techniques can have mono and multi-valued variables.
This generates
- a string for the mono valued variables
- an array of the size of the trackingkey for the multi-valued variable

If we apply this on multi-instances techniques we get:
- an array of the size of the directive count (which cannot be matched with trackingkeys) for the mono valued variables
- an array of the size of the trackingkey for the multi-valued variable

I would like this to be;
- an array of the size of the trackingkey for the mono-valued variable
- an array of the size of the trackingkey for the multi-valued variable

This should be done only for multi-instance techniques, otherwise, we would break compatibility with existing mono-instance techniques.