D27331: Remove the support for python 2

[Alexander Semke]

asemke created this revision.
asemke added reviewers: sirgienko, filipesaraiva.
Herald added a project: KDE Edu.
Herald added a subscriber: kde-edu.
asemke requested review of this revision.

REVISION SUMMARY
  The python community is sunsetting the support of python2 (https://python3statement.org/) and we should follow these activities to drop python2 in 2020. This patch removes python2 from Cantor. Old worksheets created with python2 will be moved to using python3 on load - there is a info message box to the user to notify him/her about this.

REPOSITORY
  R55 Cantor

REVISION DETAIL
  https://phabricator.kde.org/D27331

AFFECTED FILES
  src/backends/CMakeLists.txt
  src/backends/python2/CMakeLists.txt
  src/backends/python2/cantor_python2.knsrc
  src/backends/python2/python2backend.cpp
  src/backends/python2/python2backend.h
  src/backends/python2/python2backend.json
  src/backends/python2/python2backend.kcfg
  src/backends/python2/python2session.cpp
  src/backends/python2/python2session.h
  src/backends/python2/settings.kcfgc
  src/backends/python2/testpython2.cpp
  src/backends/python2/testpython2.h
  src/backends/python3/python3backend.cpp
  src/backends/python3/python3backend.json
  src/worksheet.cpp

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