Major library update and memory allocation updates

updated otc zlib 1.2.8 to 1.2.11
update isa-l 2.21 to 2.28
removed libz folder
updated patch for compilation optimizations
removed shacc files and reference from c++, headers and cmake list
upgraded gradle 3.2.1 to 5.6
Fix for issue #89
Defensive code for Smithwatermen memory allocations
New build.sh script for Linux