2018 copyright date update

test/turn/main.cpp

test/turn/test_TURN.cpp

test/turn/test_TURN.h

test/unitTest/account_factory/testAccount_factory.cpp

test/unitTest/base64/base64.cpp

test/unitTest/channel/testChannel.cpp

test/unitTest/fileutils/testFileutils.cpp

test/unitTest/map_utils/testMap_utils.cpp

test/unitTest/media/video/testVideo_input.cpp

test/unitTest/smartools/testSmartools.cpp

test/unitTest/string_utils/testString_utils.cpp

test/unitTest/utf8_utils/testUtf8_utils.cpp

tools/dringctrl/__init__.py

tools/dringctrl/controler.py

tools/dringctrl/dringctrl.py

tools/dringctrl/errors.py

tools/dringctrl/sendfile.py

tools/dringctrl/tester.py

tools/dringctrl/toggle_video_preview.py

tools/update-copyright