Force global namespace for functions which are known to be optimizable to bytecode in php, or known global functions to avoid a current namespace lookup for the function.
Fix forum activity not registering as expected when a node_name is set on the forum
Fix logging XF2.1+ reaction events as thread activity & remove old XF2.0 like handling for posts.
Replace single svUserActivity_users_who_are_viewing_this_x phrase with various svUserActivity_users_who_are_viewing_this_* phrases to enable improved translation fidelity
Update users viewing forum to respect new "Viewing container position (Forum)" option, allowing putting the viewing user list at the bottom of the forum
