Change type of port numbers from char * to uint16_t
- include/wget/wget.h: Amend struct wget_iri_st, amend API
- libwget/hsts.c: Amend port type to uint16_t
- libwget/http.c: Likewise
- libwget/http.h: Likewise
- libwget/http_highlevel.c: Likewise
- libwget/http_parse.c: Likewise
- libwget/iri.c: Likewise
- libwget/net.c: Likewise
- src/blacklist.c: Likewise
- src/host.c: Likewise
- src/wget.c: Likewise
- src/wget_host.h: Likewise
- tests/libtest.c: Likewise
- unit-tests/test.c: Likewise