Move all non-ECDSA EC logic to eckey #72

1. 
   sipa commented at 10:34 am on October 27, 2014: contributor
2. [API CHANGE] Use secp256k1_ec_ prefix for non-ECDSA key operations ae6bc76e32
3. Move non-ECDSA operations from ecdsa to eckey e2f71f1efe
4. Use internal secp256k1_eckey_ prefix for functions in eckey ffffc87855
5. Abstract out tweak logic to secp256k1_eckey_* functions eb74c36bd2
6. sipa merged this on Oct 27, 2014
7. sipa closed this on Oct 27, 2014

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8. sipa referenced this in commit b2bfdabdeb on Oct 27, 2014
9. ysangkok referenced this in commit 2f6c3353ab on Mar 19, 2020

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