Adds 'me' hotkey, updates hotkeys-help

It bothered me that there was no hotkey for emote that wasn't on the
function row. Y is now me. Activate-held-item is now only Z instead of Z
and Y.

The hotkeys-help verb in OOC tab is changed to include the changes
above, and the previously unmentioned function row hotkeys that are
pertinent to players. (Admin verbs are unmentioned)
Merge pull request #7024 from sabiram/dev

Adds 'me' hotkey, updates hotkeys-help