LBPNP-4 refactoring into Merkle tree

[dr-orlovsky]

Implements #33

[codecov]

Codecov Report

Merging #76 (dadd73d) into master (a9ef6ff) will increase coverage by 1.2%.
The diff coverage is 89.5%.

@@           Coverage Diff            @@
##           master     #76     +/-   ##
========================================
+ Coverage    83.0%   84.2%   +1.2%     
========================================
  Files          29      29             
  Lines        3537    3910    +373     
========================================
+ Hits         2936    3292    +356     
- Misses        601     618     +17     

Impacted Files	Coverage Δ
commit_verify/src/commit_encode.rs	80.8% <ø> (-19.2%)	⬇️
commit_verify/src/commit_verify.rs	93.7% <ø> (ø)
commit_verify/src/lib.rs	100.0% <ø> (ø)
commit_verify/src/merkle.rs	96.5% <ø> (ø)
src/lib.rs	87.8% <ø> (ø)
commit_verify/src/lnpbp4.rs	89.5% <89.5%> (ø)
strict_encoding/src/slice32.rs	93.2% <0.0%> (-6.8%)	⬇️

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