Allow pattern matching on automap input and output.

[local-minimum]

Is your feature request related to a problem? Please describe.
When working with Tiled, I design dungeons from a top-down perspective and have multiple levels / elevations by organizing the project into groups:

Today I must edit the layer names of the input and corresponding output layer removing the trailing index number before I start automapping the dungeon layout. And then when I want to work on an other elevation, I need to re-add the indices and start the process over.

Describe the solution you'd like
If the automapping could be done with pattern matching like input_in%d and output_out%d so that edits to a layer called in2 only outputs to out2 would be really neat.

Describe alternatives you've considered
I've tried reading through the documentation and the issue backlog and haven't found any workaround besides the procedure I describe.
I noticed issue #428 is sort of similar, but I think, it is somewhat orthogonal.