www/rtv: Update to 1.16.0

[dbaio]

Summary

 www/rtv: Update to 1.16.0

 Features

 Added the ability to copy links to the OS clipboard with y and Y.
 Both submissions and comments can now be viewed on /user/ pages.
 A MIME parser has been added for www.streamable.com.
 A MIME parser has been added for www.vidme.com.
 Submission URLs can now be opened while viewing the comments page.
 
 Bugfixes

 More graceful handling for the invalid LOCALE error on MacOS.
 A fatal error is now raised when trying to run on Windows without curses.
 Fixed an error when trying to view saved comments.
 Invalid refresh-tokens are now automatically deleted.
 Users who are signed up for Reddit's beta profiles can now launch RTV. 
	
 Approved by:	garga (mentor)
 Differential Revision:	https://reviews.freebsd.org/D11419

Test Plan

$ portlint -C
looks fine.

poudriere testport:

10.3-RELEASE-p19 amd64
10.3-RELEASE-p19 i386
11.0-RELEASE-p10 amd64
11.0-RELEASE-p10 i386
12.0-CURRENT 1200031 amd64
12.0-CURRENT 1200031 i386