STYLE: Use defaulted constructor for event object macro
STYLE: Use defaulted constructor for event object macro

LucasGandel/ITK,malaterre/ITK,BRAINSia/ITK,hjmjohnson/ITK,BRAINSia/ITK,thewtex/ITK,malaterre/ITK,vfonov/ITK,richardbeare/ITK,vfonov/ITK,LucasGandel/ITK,hjmjohnson/ITK,LucasGandel/ITK,Kitware/ITK,BRAINSia/ITK,InsightSoftwareConsortium/ITK,LucasGandel/ITK,malaterre/ITK,vfonov/ITK,hjmjohnson/ITK,thewtex/ITK,vfonov/ITK,vfonov/ITK,InsightSoftwareConsortium/ITK,vfonov/ITK,richardbeare/ITK,thewtex/ITK,vfonov/ITK,richardbeare/ITK,richardbeare/ITK,vfonov/ITK,LucasGandel/ITK,Kitware/ITK,Kitware/ITK,thewtex/ITK,hjmjohnson/ITK,thewtex/ITK,malaterre/ITK,Kitware/ITK,thewtex/ITK,vfonov/ITK,BRAINSia/ITK,malaterre/ITK,malaterre/ITK,Kitware/ITK,hjmjohnson/ITK,thewtex/ITK,richardbeare/ITK,InsightSoftwareConsortium/ITK,hjmjohnson/ITK,richardbeare/ITK,BRAINSia/ITK,malaterre/ITK,hjmjohnson/ITK,LucasGandel/ITK,InsightSoftwareConsortium/ITK,LucasGandel/ITK,richardbeare/ITK,InsightSoftwareConsortium/ITK,InsightSoftwareConsortium/ITK,Kitware/ITK,Kitware/ITK,BRAINSia/ITK,BRAINSia/ITK,InsightSoftwareConsortium/ITK,malaterre/ITK,malaterre/ITK,LucasGandel/ITK