Downstream merge from 494-maint-wassail

.hgtags

indra/llappearance/llwearabletype.cpp

indra/llappearance/llwearabletype.h

indra/llcommon/llsingleton.cpp

indra/llcommon/llsingleton.h

indra/llcommon/tests/lleventcoro_test.cpp

indra/llcommon/tests/lleventdispatcher_test.cpp

indra/llcommon/tests/lleventfilter_test.cpp

indra/llcommon/tests/llinstancetracker_test.cpp

indra/llcommon/tests/lllazy_test.cpp

indra/llcommon/tests/llleap_test.cpp

indra/llcommon/tests/llprocess_test.cpp

indra/llcommon/tests/llsingleton_test.cpp

indra/llcommon/tests/wrapllerrs.h

indra/llimage/llimage.cpp

indra/llimage/llimage.h

indra/llimage/llimagej2c.cpp

indra/llmessage/llavatarnamecache.cpp

indra/llmessage/llavatarnamecache.h

indra/llmessage/llproxy.cpp