Honor GTK project name¹, except some files…
…where it refers to previous name of the project.
¹ https://mail.gnome.org/archives/gtk-devel-list/2019-February/msg00000.html
Adjust example name and description2021-03-19T19:14:32ZRicardo Monesricardo@mones.orgRicardo Monesricardo@mones.org2021-03-19T19:14:32Zhttp://git.claws-mail.org/?p=claws.git;a=commitdiff;h=beb78605ff96e09218a2f84d63dd725ab4f1c7b8