Add DataColumn::$encodeContent

[vjik]

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.67%. Comparing base (7c2fc6c) to head (03b9a9c).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #266      +/-   ##
============================================
+ Coverage     83.63%   83.67%   +0.04%     
- Complexity      626      629       +3     
============================================
  Files            51       51              
  Lines          2132     2138       +6     
============================================
+ Hits           1783     1789       +6     
  Misses          349      349              

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