More terrain types

[cazfi]

Found also these.

Would it be possible to get similar three (or at least one) volcano sprites for hexemplio? One inactive, and two frames of eruption. One sprite would already enable use of volcano terrain in custom rulesets, multiple frames would allow me to play with some animating ideas.

[cazfi]

multiple frames would allow me to play with some animating ideas.

Like demonstrated with existing amplio2 volcano: https://www.cazfi.net/freeciv/volcano.mp4

This is not client side animation support, but just server side lua script altering terrain types. Maybe not very good use of computing resources, but at least this shows that it can be done on some scale while we wait for proper client side animation support.