[#modding] feature request: allow for merging cells/zones in `Worlds.xml` (or otherwise all...

[Freehold Games Bot Account]

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<torn sheet of graph paper> feature request: allow for merging cells/zones in Worlds.xml (or otherwise allow for more surgical changes to cells)

[kernelmethod]

(copying over a comment I accidentally made on #9459 instead of this issue):

For context: this came up today while somebody was trying to add an NPC to level 19 of the Asphalt Mines. It appears that the best way to do this without breaking compatibility with other mods that may want to make modifications to this cell is to add

<cell Name="Asphalt Mines" Inherits="Asphalt Mines" ApplyTo="TerrainAsphaltMines">
...
</cell>

… then to re-define the zone for Level="29", copying the same XML already used by the game's Worlds.xml but with the addition of a new poptable.

This works but is rather unwieldy (and depends on some implicit behavior in the way in which Worlds.xml is parsed).