* chore: rename tr_strvContains to tr_strv_contains
* chore: rename tr_strvStartsWith to tr_strv_starts_with
* chore: rename tr_strvEndsWith to tr_strv_ends_with
* chore: rename tr_strvSep to tr_strv_sep
* chore: rename tr_strvStrip to tr_strv_strip
* chore: rename tr_strvToBuf to tr_strv_to_buf
* refactor: rename tr_saveFile() to tr_file_save()
rename tr_loadFile() to tr_file_read()
rename tr_moveFile() to tr_file_move()
* refactor: rename tr_parseNum() to tr_num_parse()
refactor: rename tr_parseNumRange() to tr_num_parse_range()
* chore: group related functions together in header
* 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
* fix: save log level, encryption mod, preallocation mode as ints
* fix: ensure log level is saved in tr_sessionGetSettings()
* fix: ensure the right verbosity row is selected
