Improvements and bugfixes for command-line interface

[dr-orlovsky]

This also includes #254 and closes #204

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 283 lines in your changes missing coverage. Please review.

Project coverage is 2.8%. Comparing base (e3bb8e3) to head (a3b2e43).

Files with missing lines	Patch %	Lines
cli/src/command.rs	0.0%	214 Missing ⚠️
src/filters.rs	0.0%	18 Missing ⚠️
src/wallet.rs	0.0%	16 Missing ⚠️
src/pay.rs	0.0%	14 Missing ⚠️
cli/src/args.rs	0.0%	11 Missing ⚠️
src/lib.rs	0.0%	7 Missing ⚠️
cli/src/main.rs	0.0%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #248     +/-   ##
=======================================
- Coverage     3.0%   2.8%   -0.3%     
=======================================
  Files          14     15      +1     
  Lines        1753   1915    +162     
=======================================
  Hits           53     53             
- Misses       1700   1862    +162     

Flag	Coverage Δ
rust	2.8% <0.0%> (-0.3%)	⬇️

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