gplugin/gplugin

Make property registration consistent

2021-10-09, Elliott Sales de Andrade
cbac138e5c89
Make property registration consistent

Always order it permissions, construct-only (if applicable), static strings.
And add static strings everywhere, since they are.

Testing Done:
Compile only.

Reviewed at https://reviews.imfreedom.org/r/1010/
EionRobb <> EionRobb <eion@robbmob.com>
ivanhoe <107501-ivanhoe@users.noreply.gitlab.com> ivanhoe <ivanhoe@fiscari.de>
Richard Laager <rlaager@pidgin.im> <rlaager@wiktel.com>