Fix style in toxav.c.

* Use Camel_Snake_Case for type names.
* Use at least 4 characters for constant names. I.e. `END` is a type
  name, but `RETURN` is a constant name. This is because `DHT` is a type
  name (yay consistency).
* Using `min_*` functions instead of MIN, we can avoid a cast.
* Use `for`-loops for for-each-frame semantics instead of `while`.
* Don't use assignments as expressions.
* `++i` instead of `i++`.
* Function pointers are dereferenced automatically, so no need to
  manually do so.
* Avoid void pointers that lie about not being spaghetti code. Toxcore
  and toxav are both spaghetti and shouldn't pretend anything else.
* Don't use empty statements (e.g. no `;;` anywhere in the code).

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