Use compile time detection of what features are available #137
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Previously features were gated on the botan3 feature (which is removed here). This didn't work well in practice as it made it difficult to add support for features added in Botan3 after the 3.0 release.
Add declarations in botan-sys for functions added to ffi.h since 3.0.0, gated on the detected library version. Also add interfaces for some of the new functionality to the high level Rust crate.