proto_tree_add_text -> something filterable.

Most of the items fell under the same 3 filterable fields. Many got converted to proto_tree_add_bitmask. Also removed the superfluous return statements

Change-Id: Ib429f986d1c3648e51add8ad3d208428b0ba898c
Reviewed-on: https://code.wireshark.org/review/4044
Petri-Dish: Michael Mann <mmann78@netscape.net>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Michael Mann <mmann78@netscape.net>