MAJOR: fd: replace all EV_FD_* macros with new fd_*_* inline calls

These functions have a more explicity meaning and will offer provisions
for explicit polling.

EV_FD_ISSET() has been left for now as it is still in use in checks.
diff --git a/src/fd.c b/src/fd.c
index 7958087..a3b1ab0 100644
--- a/src/fd.c
+++ b/src/fd.c
@@ -37,7 +37,7 @@
  */
 void fd_delete(int fd)
 {
-	EV_FD_CLO(fd);
+	cur_poller.clo(fd);
 	port_range_release_port(fdinfo[fd].port_range, fdinfo[fd].local_port);
 	fdinfo[fd].port_range = NULL;
 	close(fd);