* refactor: move tr_tracker_http_announce() helper funcs into their own namespace
* refactor: move tr_globalIPv6() helper funcs into their own namespace
* refactor: move tr_address_is_valid_for_peers() helper funcs into their own namespace
* refactor: make tr_address_compare() a private method
* refactor: rename tr_address::isIPv4() to is_ipv4()
* refactor: use snake_case for tr_address methods
* refactor: make tr_address_is_valid_for_peers() a member function
* refactor: add tr_rand_obj()
There are a lot of places in the codebase where we need to populate
an integral type or a fixed-size array with random data. To do this,
we instantiate a local on the stack, fill it with tr_rand_buffer(),
and then use it.
This PR creates a helper function to make this a one-liner.
Charles Kerr