This change removes the dependency for loading and retrieving shader
parameter values from the helper. This simplifies the dataflow,
as it only flows down to the helper rather than bi-directional.
This is foundational work to improve the shader experiece. Future
iterations will include support for sharing presets, more flexible
UI customisation and more.
Introduced `OEGameStartupInfo` to capture startup parameters for
loading a core and ROM.
A future iteration of this API will provide a generic container.
Stuart Carnie
Daniele Cattaneo