Request: Use DFHack to change the fallen tree count to only count surface trees

[BeerNTacos]

Per an interview with Blind, Tarn Adams stated that the fallen tree count used to gauge elven and wilderness reactions is not supposed to count the eight underground mushrooms harvested for logs.

With that in mind, an option in DfHack to only count above ground trees for the number of allowable trees to be cut would be more in line with the original intentions of the fallen tree counts.

[quietust]

In order to do this, we would need to watch for subterranean tree cutting jobs and undo the tree fell count increment afterwards.

[myk002]

I think this would be possible. We can track the creation of the fell tree jobs, determine the target tree type, and take corrective action when the job completes.