warp: dragmfact + dragcfact compatibility

These set of changes introduce:
   a) a flag to ignore warp from happening while dragmfact or
      dragcfact is being used and
   b) a flag to force warp when killclient or showhideclient
      is used, to make for a more intuitive experience

ref. https://github.com/bakkeby/patches/issues/11

patch/bar_wintitleactions.c

@@ -80,6 +80,9 @@ showhideclient(const Arg *arg)
 	if (!c)
 		return;
 
+	#if WARP_PATCH
+	force_warp = 1;
+	#endif // WARP_PATCH
 	if (HIDDEN(c)) {
 		show(c);
 		focus(c);