Introducing chuks of settings in Presets

[Pedja]

While creating Presets I stumbled into an issue: number of presets share the same tag structure, and I have to repat the same structure again and again. Problem occures if there is need to change structure because one must go all way down through presets and make changes in each of them.

It would be good to have something like a chunk or subpreset, which is defined by name and contains definitions for part of preset, whole preset or even several presets. Then new preset item called <chunk> or <subpreset> could be used to mark where in definition chunk has to be inserted.

Result would be that we could define structure in one place and reuse it in several places.

This could also help in reusing presets in seveal groups. For example, if I have group for traffic objects and group for mountainbiking objects, both groups could share some of the presets so one who edits map does not have to look through all preset definitions as ones he needs for specific type of mapping are kept together.

[simon04]

A possible implementation (already containing a patch) is being discussed in #9327.

[Don-vip]

Closed as duplicate of #9327.