Autocomplete options by categories on sending mail

Use it to have autocomplete only for chosen category/categories to avoid sending something precious to someone else.

You can select in send mail dialog autocomplete for:

* One of your alts
* One of your friends who is online
* One of your guildies who is online
* One of your friends who is offline
* One of your guildies who is offline
* Someone you interacted with
* Mix of options

Slash handlers (/AltsMail +):

* show - shows alt names
* add - add alt name
* remove - remove alt name

Alt names will be stored after entering game with them (or by "/AltsMail add somename" slash command).

P.S. - MoP compatible (change to "Interface: 50001" for Mop, "Interface: 40300" for live 4.3, in toc file or enable outdated addons).