Draft: Packaging: Add partial support for delayed_load plugins
This adds partial support for delayed_load plugin in the ParaView superbuild. Please note this is not used by any packaged plugins yet but will be soon in ttk.
In order to support delayed_load plugin this add:
- Packaging XML files installed inside of a plugin folder (which DELAYED_LOAD mechanism do)
- When crafting the paraview plugin configuration file, look for a
plugin_name.plugins.xml
and use it instead of crafting the line manually - Improve README.md
Related issue: #279