name change to osl-ephys (osl_ephys)

[matsvanes]

The package is now called osl-ephys. The submodules are in the osl_ephys directory, so imports happen as:
from osl_ephys import preprocessing.

Some references are still called osl, for example, the source recon (RHINO) techniques, the "osl_wrappers", and the "osl" log config.

[cgohil8]

Some references are still called osl, for example, the source recon (RHINO) techniques, the "osl_wrappers", and the "osl" log config.

I think this is fine.