Search in multiple dictionaries

[JingMatrix]

Is your feature request related to a problem? Please describe.
A clear and concise description of what the problem is. Ex. I'm always frustrated when

I can only look up words in one selected dictionary.

Describe the solution you'd like
A clear and concise description of what you want to happen.

I should be able to group my dictionaries.
Results from different dictionaries of a given group are presented in the search panel, and I should be able to select which dictionary group to look up words.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

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