SL-15297 performance floater ui update

indra/newview/llfloateravatarrendersettings.cpp

indra/newview/llfloateravatarrendersettings.h

indra/newview/llfloaterperformance.cpp

indra/newview/llfloaterperformance.h

...w/skins/default/xui/en/floater_avatar_render_settings.xml

indra/newview/skins/default/xui/en/floater_performance.xml

...w/skins/default/xui/en/menu_avatar_rendering_settings.xml

...ins/default/xui/en/menu_avatar_rendering_settings_add.xml

...iew/skins/default/xui/en/panel_performance_complexity.xml

...a/newview/skins/default/xui/en/panel_performance_huds.xml

...newview/skins/default/xui/en/panel_performance_nearby.xml

...ew/skins/default/xui/en/panel_performance_preferences.xml

...ewview/skins/default/xui/en/panel_performance_presets.xml

...kins/default/xui/en/panel_performance_troubleshooting.xml