* Check arguments passed to secp256k1 methods
Illegal arguments will trigger an internal callback that prints to stderr and calls abort.
We already check arguments in our JNI and kotlin native code but had missed 2 checks (recid in ecdsaRecover, empty arrays in pubkeyCombine).
* Implement the same "tweak" checks in the native code and JNI code
The native code was missing checks on the "tweak" size (which must be 32 bytes)
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