Easy Mail fixup

        removed pointless, unreliable popup for multiattach. added proper lockout for trying to multiattach AND multitsend. multisend now uniquifies list. that's totally a word.
        Errors are now printed in red.
        Added a Clear button to clear recipients and attachments. you can also now clear an item by right clicking the item in inventory. right clicking also cleans up invalid items from attachments.
        sending attachments should no longer vomit items if an item that was going to be sent is moved (it will just silently remove it from the list).
        when first created, contact list defaults to friends instead of none. now properly renders on the same layer as the main window by default.
        streamlined bag handling code. added support for bag 8 (and it's easily modifiable).