Adds the "Underground" layer to the tactical display Next and Prev search.#787

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CCHyper wants to merge 2 commits intoVinifera-Developers:developfrom CCHyper:bugfix/sub-next-prev-obj

+114

Commits on Dec 26, 2023

Reimplements DisplayClass::Next_Object and DisplayClass::Prev_Object.
CCHyper
committed
Adds LAYER_UNDERGROUND to Next and Previous display search.
CCHyper
committed