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I guess it was simply overlooked originally; in any case, currently
used compilers deal with the reference just as fine as with the pointer.
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SingleKeyValue is a tiny wrapper and supposed to be discreet.
Having to explicitly (even if only with braces) construct its objects
stands in the way of readability on the consuming side of the code and
sometimes prevents direct initialisation of event objects without
constructors getting some kind of ContentParamTs parameter pack where
a single content_type argument would suffice otherwise.
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This is a rework of EventContent::SimpleContent previously defined in
simplestateevents.h. Quite a few events (and not only state events) have
just a single key-value pair in their content - this structure (which
is really just a template wrapper around the value) and the accompanying
JsonConverter<> specialisation encapsulate the concept to streamline
definition of such events. This commit only has simplestateevents.h
using it; further commits will use SingleKeyValue in other places.
toSnakeCase is a facility function that converts camelCase used for
C++ variables into snake_case used in JSON payloads. Combined with
the preprocessor trick that makes a string literal from an identifier,
this allows to reduce boilerplate code that repeats the same name for
fields in C++ event classes and fields in JSON. SingleKeyValue uses it,
and there are other cases for it coming.
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