Simplify/fixup DeviceStateResponse

[RReverser]

• Name property is common to any DeviceState variant, so instead of making the object itself a collection of variants, I extracted the common Name property and made only Value variadic.
• Value has been changed to match ASCOM definition closer - there is no need to list integer/float or string/datetime separately, as they're represented in the same way in JSON, and interpreting the Value requires custom handling depending on property Name anyway.
• Instead of using anyOf, use oneOf like in other definitions. In this case they'll behave in the same way, but generally anyOf has different semantics - "match 1 or more of the following types at the same time" instead of "match 1 of the following types exclusively".
• Instead of using inline code syntax for "Platform 7 onward" notes, switched them to just bold as that seems more appropriate semantically and visually.

[Peter-Simpson]

Thanks Ingvar, I'm going to accept this PR and will retain your structural changes from anyOf to oneOf etc.

I chose the original "Platform 7 onward" style in order to make the change stand out, so will likely revert to this visual style since it doesn't impact use of the YAML file. I may also update the descriptions, for example, "variadic" is not a term with which most people will be familiar.

Thanks, Peter

[RReverser]

I chose the original "Platform 7 onward" style in order to make the change stand out, so will likely revert to this visual style since it doesn't impact use of the YAML file.

Yeah it's mostly a semantic difference - that syntax is intended for pieces of code, not actual human text. But fair enough, it doesn't really impact me.

[RReverser]

for example, "variadic" is not a term with which most people will be familiar

Hm I see you changed it to "object", but I think that's also going to be pretty confusing to people coming from languages that don't have "everything is an object / is castable to an object" paradigm that C# has. In many languages, "object" has a strict meaning and is synonymous with "struct" or "class".

I'd probably change it to "This is a dynamically-typed variable" or even just "This is a variable..." since you go on to list all the types it can hold in the same sentence.