Use guint64 for time-related values of movie objects (in ns)

6 jobs for issue-777 in 7 minutes and 23 seconds (queued for 54 seconds)
Status Job ID Name Coverage
  Build
passed #522160
build

00:03:47

passed #522165
build_android

00:02:46

passed #522161
build_clang_libcpp

00:03:41

passed #522164
build_clazy

00:03:34

passed #522163
build_mingw64_fedora

00:03:33

passed #522162
build_ubuntu_16_04

00:01:52