Reorder m_enabled member on Trackable class to avoid warning when -Wreorder is turned on
Reorder m_enabled member on Trackable class to avoid warning when -Wreorder is turned on

hellowshinobu/easyloggingpp,hellowshinobu/easyloggingpp,hellowshinobu/easyloggingpp,spthaolt/easyloggingpp,simonhang/easyloggingpp,dreal-deps/easyloggingpp,arvidsson/easyloggingpp,spqr33/easyloggingpp,lisong521/easyloggingpp,blankme/easyloggingpp,simonhang/easyloggingpp,dreal-deps/easyloggingpp,simonhang/easyloggingpp,lisong521/easyloggingpp,chenmusun/easyloggingpp,spthaolt/easyloggingpp,spqr33/easyloggingpp,blankme/easyloggingpp,utiasASRL/easyloggingpp,utiasASRL/easyloggingpp,utiasASRL/easyloggingpp,chenmusun/easyloggingpp,blankme/easyloggingpp,dreal-deps/easyloggingpp,arvidsson/easyloggingpp,chenmusun/easyloggingpp,lisong521/easyloggingpp,spthaolt/easyloggingpp,spqr33/easyloggingpp,arvidsson/easyloggingpp