Refactors codebase for official 1.0 launch.

Updated:

• high-level API
• internal config class (closer mimic sz3)
• split main class into compressor and decomperssor classes in separate files
• centralized all internal memory management into buffer struct
• cudastf demo into callable API (bare bones right now -- not fully working yet)
• cudastf timing framework (use cudaEvents w/ task_fence)
• CMakeLists.txt to be much more organized and functional -- added one specific to example code

Adds:

• Huffman ReVISIT changes (from dev cuSZ branch)
• additional user control through config (e.g. size of internal buffer for outliers, quantization bin radius)
• documentation wiki pages for CLI, modules, and build/install instructions
• example codes for cudastf, simple usage, regular usage, and pipeline comparison (pipeline comparison in the works)
• data download script
• updated README and LICENSE
• full CLI tooling with help/version printout and lots of functionality (similar to cuSZ)
• ZSTD compression as a secondary codec option (not fully tested)
• error handling and sanity checks at needed locations

Removes:

• testing ability -- will need to update for changed apis and error handling strategies

To-Do:

• add rest of example codes to examples/CMakeLists.txt
• finish pipeline example and document examples further
• run codes through compute-sanitizers and update c++ code to be compliant with standards
• write-up wiki pages for cudastf and high-level api
• write a profiling/benchmarking suite (run script + data collection)
• add a CHANGELOG file and update it to current state
• finish the CUDASTF API functionality (decompression bug, modules, non file IO api, data quality, profiling instructions)