Optionally, have group chat and conference buttons on title line.

Adds UseConciseGroupChatButtons, and UseConciseConferenceButtons
Adds "Buttons on group chat name line (Affects new group chats)" and "Buttons on conference title line (Affects new conferences)" checkboxes to Adv. Chat's Chat UI tab.
Adds floater_instant_message_ad_hoc_concisebuttons.xml, floater_instant_message_group_concisebuttons.xml

Brings panel_speaker_controls.xml's speakers_list down by 7 pixels, which is necessary because it is awkwardly high in old places as well, such as Local Chat.