Move voip and encryption stuff into their own directories

CMakeLists.txt

src/Cache.cpp

src/ChatPage.cpp

src/MainWindow.cpp

src/UserSettingsPage.cpp

src/encryption/DeviceVerificationFlow.cpp

src/encryption/DeviceVerificationFlow.h

src/encryption/Olm.cpp

src/encryption/Olm.h

src/encryption/SelfVerificationStatus.cpp

src/encryption/SelfVerificationStatus.h

src/timeline/EventStore.cpp

src/timeline/EventStore.h

src/timeline/InputBar.cpp

src/timeline/TimelineModel.cpp

src/timeline/TimelineViewManager.cpp

src/timeline/TimelineViewManager.h

src/ui/NhekoGlobalObject.cpp

src/ui/UserProfile.cpp

src/voip/CallDevices.cpp