🪧[QUESTBOARD-FEATURE] Implement standard user-options for renderer (toggle coronas, etc)

[onnoj]

Normally, the renderer plugins in Deus Ex implement a number of default options.
For example, with the default software renderer, you can set the following options in the deusex.ini file:

• Translucency=True
• VolumetricLighting=True
• ShinySurfaces=False
• Coronas=False
• HighDetailActors=True
• HighResTextureSmooth=True
• LowResTextureSmooth=False
• FastTranslucency=True

Currently, this renderer does not implement any user-options at all.
It would be good if there was at least an option to toggle the coronas.

Options specific to this renderer could be:

• If the thread affinity hack should be enabled
• If unlit textures should be rendered as emissive.
• Anything for future features, like self-shadowing.
• Maybe flashlight settings

Ideally, this would be implemented as a class that abstracts the reads from GConfig, is accessible as a singleton, and offers getters/setters for the properties (perhaps to initialize defaults). The goal is to make sure all properties are funnelled through this configuration manager, so that all definitions are together and documented.

[onnoj]

For reference, you can check the other existing renderers, or if SoftDrv.cpp (the default software renderer).
Basically, it involves calls to GConfig->GetSectionPrivate and GConfig->GetInt