[Tagging] RFD pipeline sub tag substance

[althio]

Throwing out my ideas...

Disclaimer:
These are generic proposals for pipeline sub-tagging with example values
for illustration.
I do not want to derail this towards water/drinking_water and multi-values
(semicolon or namespaced). ;)

I propose 3 keys: use/purpose (as main subtag), state/phase and
substance/name.

pipeline:use = * or pipeline:purpose = *
values limited to list eg.: drinking_water, wastewater/sewage,
drain/irrigation, transport/transmission, heating, coolant, industrial,
communication...

[IMO this is the most interesting data to be rendered or externally used:
the intent of the pipeline]
May clash or need to be merged with the tag for pipeline:
usage = * (currently very specific and oil&gas oriented).

Then additionally, because it can be informative and described with fixed
values
substance:state = * or substance:phase = *
values limited to list eg.: gas, liquid, solid (cables), slurry
(=liquid+solid particles), multi (=multiphase, mostly gas and liquid,
possibly particles)

Then, a bit of freedom with free-form value (possibly multi-values):
substance:name = *, eg.:
water, fresh_water, grey_water, steam...
natural_gas, oil...
chemical...
cables, optic_fiber...
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