misc: update copyright date

CMakeLists.txt

generate-string.sh

src/AccAdvancedRingVC.h

src/AccAdvancedRingVC.mm

src/AccAdvancedSipVC.h

src/AccAdvancedSipVC.mm

src/AccAdvancedVC.h

src/AccAdvancedVC.mm

src/AccRingGeneralVC.h

src/AccRingGeneralVC.mm

src/AccSipGeneralVC.h

src/AccSipGeneralVC.mm

src/AccountSettingsVC.h

src/AccountSettingsVC.mm

src/AddSIPAccountVC.h

src/AddSIPAccountVC.mm

src/BackupAccountWC.h

src/BackupAccountWC.mm

src/ConversationVC.h

src/ConversationVC.mm