Font debugging aid to dump descriptors + individual textures

indra/llrender/llfontbitmapcache.h

indra/llrender/llfontfreetype.cpp

indra/llrender/llfontfreetype.h

indra/llrender/llfontgl.cpp

indra/llrender/llfontgl.h

indra/llrender/llfontregistry.cpp

indra/llrender/llfontregistry.h

indra/newview/llviewermenu.cpp

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

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