Function definition, application

[greenhat]

Close #159

• Block eval;
• ValDef and ValUse eval;
• FuncValue eval;
• Apply eval;
• serialization for added nodes;
• test eval for added nodes;
• update interpreter implementation progress chart;
• update changelog;

[codecov-io]

Codecov Report

Merging #171 (aad2f9b) into develop (c644088) will decrease coverage by 1.03%.
The diff coverage is 65.92%.

@@             Coverage Diff             @@
##           develop     #171      +/-   ##
===========================================
- Coverage    85.31%   84.27%   -1.04%     
===========================================
  Files           83       91       +8     
  Lines         3785     4032     +247     
===========================================
+ Hits          3229     3398     +169     
- Misses         556      634      +78     

Impacted Files	Coverage Δ
ergo-lib/src/ast/coll_fold.rs	0.00% <0.00%> (ø)
ergo-lib/src/ast/global_vars.rs	57.14% <0.00%> (-42.86%)	⬇️
ergo-lib/src/ast/predef_func.rs	0.00% <0.00%> (ø)
ergo-lib/src/ast/property_call.rs	25.00% <0.00%> (ø)
ergo-lib/src/ast/value.rs	58.86% <ø> (ø)
ergo-lib/src/eval.rs	83.33% <ø> (+3.33%)	⬆️
ergo-lib/src/serialization/data.rs	88.67% <0.00%> (-1.71%)	⬇️
ergo-lib/src/serialization/op_code.rs	75.00% <ø> (ø)
ergo-lib/src/sigma_protocol/prover.rs	74.10% <ø> (ø)
ergo-lib/src/sigma_protocol/verifier.rs	85.96% <ø> (ø)
... and 30 more

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