global: spelling mistake fixes

* Fixes various spelling mistakes, e.g. `Wofklow`.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
global: simplification of licensing

* Simplifies Workflow licensing to use more permissive Revised BSD
  License only.

* Renames the license file to more usual `LICENSE`.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>