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This PR removes the NEORV32 stream link interface (SLINK) entirely from the project.
The SLINK has shown to be an over-engineered interface (#377, #349, #182, ...) trying to provide as much configuration options as possible - resulting in a far too complex handling.
Users are better advised to implement stream interfaces (such as AXI-Stream) as custom peripherals connected via the processor's memory interface (or as a tightly-coupled module via the processor's Custom Functions Subsystem).
However, discussions are always welcome 😉
A future version of the core might re-introduce the SLINK interface.