…g in the end of 3 phase of ICO (#718)

* Remove memory leak of score reference.

* Update score generation tool.

* Add more data for testing

* Reduce complexity of clean up neurons.

* Adapt score reference hyperidentity and addition score.

* Separate score engine to qubic's score.

* Add score addition algorithm.

* Change score test with new addition score.

* Score use INVALID_THRESHOLD as invalid score.

* Add dummy getLastOuput for qpi's mining.

* Add dummy qubic's solution threshold.

* Init memory for compute buffer.

* ScoreAddition: Process each 64 samples with SIMD.

* Fix score computation match with Qiner version.

* Update score addtion test cases.

* Update sample file with header.

* Minimal config for test score.

* Change score's algo enum.

* Support multiple score thresholds.

* Get last output for mining only run the hyperidentity algo.

* Replace memcpy with save/load with SIMD register.

* Remove threshold related comments.