* [core]: fix oyMakeDir_ usage in oyWriteMemToFile_()

The bug prevented to create a file without preexisting directory.
* [exmpl]: attempt to check for device class from taxi
* [exmpl]: remove oy-taxi script

The oyjl/oyjl binary is not there any more. So the script is unuseable.
Use the src/examples/taxi tool instead.
* [docu]: update PACKAGING file