[request] Node parameters: allow to override greyed out parameters and reuse inputs

[natowi]

Is your feature request related to a problem? Please describe.

If you computed a node with specific describers, you can nor reuse a subset in a new node, as deselecting is disabled: (I want to select sift and deselect dspsift but want to keep akaze)

Describe the solution you'd like Use cases:

• compute one node initially with combination of describer types but later on you want to run another test without recomputing everything. At the moment you need to run the new node, stop it and manually copy the precomputed results from the old node in the new node

• combine computations: allow to merge the describer results from multiple nodes (one was done for sift, one for akaze) as input for a new node without the need for recomputing

• allow to override greyed out parameters and reuse inputs

Describe alternatives you've considered manually copying files from node folders

Additional context Add any other context or screenshots about the feature request here.