For EXT-4666: changed LLGestureManager to LLGestureMgr throughout

indra/newview/llappearancemgr.cpp

indra/newview/llappviewer.cpp

indra/newview/llassetuploadresponders.cpp

indra/newview/llchatbar.cpp

indra/newview/llfloatergesture.cpp

indra/newview/llgesturemgr.cpp

indra/newview/llgesturemgr.h

indra/newview/llinventorybridge.cpp

indra/newview/llinventoryfunctions.cpp

indra/newview/llnearbychatbar.cpp

indra/newview/llpreviewgesture.cpp

indra/newview/llstartup.cpp

indra/newview/lltooldraganddrop.cpp

indra/newview/llviewerinventory.cpp

indra/newview/llviewerwindow.cpp

indra/newview/llvoavatar.cpp