EXT-2779 World map - clean up layout and simplify

indra/newview/skins/default/textures/icon_event_adult.tga

indra/newview/skins/default/textures/icon_top_pick.tga

indra/newview/skins/default/textures/map_avatar_16.tga

indra/newview/skins/default/textures/map_avatar_8.tga

indra/newview/skins/default/textures/map_event.tga

indra/newview/skins/default/textures/map_event_adult.tga

indra/newview/skins/default/textures/map_event_mature.tga

indra/newview/skins/default/textures/map_home.tga

indra/newview/skins/default/textures/map_infohub.tga

indra/newview/skins/default/textures/map_telehub.tga

indra/newview/skins/default/textures/textures.xml

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

...view/skins/default/xui/en/panel_region_general_layout.xml