D13890: Add variable manager and fix some unicode errors for R backend

[Nikita Sirgienko]

sirgienko marked 2 inline comments as done.

REPOSITORY
  R55 Cantor

REVISION DETAIL
  https://phabricator.kde.org/D13890

To: sirgienko, asemke
Cc: kde-edu, asemke, narvaez, apol
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