Trying to fix Nektar reader plugin for installation and packaging.

The Nektar reader plugin doesn't get packaged properly so
following other plugins to do modules for dependent libraries and
separate directory for the actual plugin code itself.

Change-Id: Ic4a2c222e2790e9e6219d3b50bd31206b535177d
Merge topic '14240_nektar_plugin_packaging' into next

b3b1750 Trying to fix Nektar reader plugin for installation and packaging.