v0.5.2

Changed

• Replace NEON horizontal sums with implementations using vaddvq on Aarch64 and vpaddl on Armv7.
• Remove one layer of table lookup in all Similarity::CalculateVectors implementations.
• Make all SIMD code use local buffers and deallocate early.

Fixed

• Invalid operator being used in Cython code to deallocate C++ arrays.

Added

• SSE2 and NEON implementations for the Gaps statistic.