BitMagic release v7.8.0

Release Notes: BitMagic 7.8.0

1. Implemented complete set of index-free search methods on compressive memory vectors with
   bm::sparse_vector_scanner<>: GT, GE, LT, LE, RANGE fast search functions.
   New search logic uses fast bit-vector operations without de-compressing the succinct models
   to solve search logic problems fast and without external indexes overhead
   New functionality is important for both search systems and columnar databases.

2. New example on how to use the new scanner search functions:
   https://github.com/tlk00/BitMagic/tree/master/samples/svsample10

3. SSE2 improvements: added more SSE2 kernels and optimizations.

4. First version of ARM NEON optizations (as SSE2 to NEON translation).
   Tested on R-Pi, it adds up to 25% performance gain in some logic search benchmarks.

Release notes:
http://bitmagic.io/bm-7.8.0.html