Allow SensorRegion to pass actValue and bucketIdx to SDRClassifierRegion

[marionleborgne]

The network API does not support continuous inference at the moment. So far, the workaround has been to call customCompute() on the classifier region to do inference.

What is required to fix the issue: create new links between sensor and classifier regions so that the SensorRegion can pass bucketIdx and actValue to the SDRClassifierRegion. This way inference can happen within the network, without having to call customCompute() in an outer loop.