Fix style in DHT.c.

* Removed `ARRAY_SIZE` and use NULL markers for end of array, instead.
  The alternative is + size, but for these arrays, NULL markers made
  sense, since they are arrays of non-null pointers.
* Made `INDEX_OF_PK` a self-contained macro, not dependent upon the
  naming inside its call site. This is a minor change but makes the code
  more local and reviews easier.
* No nested structs.
* Use only named function types ending in `_cb` for callbacks.
* Replaced two macros with functions.
* `++i` instead of `i++`.
* struct member names start with lowercase letters.
* It takes a bit of work to support `/**/` comments in preprocessor
  macros, so I've decided not to support these. If a macro is complex
  enough to need comments inside it, it's too complex. `//` comments are
  allowed at the end of macro definitions.
* Callback typedefs must name their parameters.

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