Add more constants and shorcut methods

[arogachev]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.82%. Comparing base (5b9f1e4) to head (e4f97de).
Report is 4 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #65      +/-   ##
============================================
+ Coverage     96.63%   96.82%   +0.18%     
- Complexity       51       54       +3     
============================================
  Files             3        3              
  Lines           119      126       +7     
============================================
+ Hits            115      122       +7     
  Misses            4        4              

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[vjik]

Add changelog