lib/wp: merge both WpRemote & WpRemotePipewire in WpCore
In practice we always create a remote and connect to pipewire. Any other scenario is invalid, therefore, it is not justified to be confused with so many classes for such small functionality. This simplifies a lot the modules code. Also, this commit exposes the pw_core and pw_remote objects out of WpCore. This is in practice useful when dealing with low-level pw and spa factories, which are used in the monitors. Let's not add API wrappers for everything... Bindings will never use this functionality anyway, since it depends on low level pipewire C API.
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