Overwork API

[SimeonEhrig]

Ideas:

• separate functions, which requires host memory pointers or device pointer in the namespaces vikunja::host and vikunja::device
• allow to pass alpaka buffer instead plain pointer
• use begin and end pointer instead begin pointer and size (use specialization tratis to specialize function for pointer types like random access pointer)
• make vikunja compatible with pointers of the std library

[SimeonEhrig]

documentation about, how the std handles pointer: https://en.cppreference.com/w/cpp/iterator/iterator_traits