Change keymapping for run selection/line in Python terminal

[d3r3kk]

Fixes #2068

This pull request:

• Has a title summarizes what is changing
• Includes a news entry file (remember to thank yourself!)
• Has unit tests & code coverage is not adversely affected (within reason)
• Works on all actively maintained versions of Python (e.g. Python 2.7 & the latest Python 3 release)
• Works on Windows 10, macOS, and Linux (e.g. considered file system case-sensitivity)

[codecov]

Codecov Report

Merging #2077 into master will increase coverage by 0.14%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2077      +/-   ##
==========================================
+ Coverage   79.81%   79.96%   +0.14%     
==========================================
  Files         307      307              
  Lines       14086    14083       -3     
  Branches     2499     2499              
==========================================
+ Hits        11243    11261      +18     
+ Misses       2831     2810      -21     
  Partials       12       12

Flag	Coverage Δ
#MacOS	74.08% <ø> (+0.07%)	⬆️
#Windows	74.22% <ø> (+0.13%)	⬆️

Impacted Files	Coverage Δ
src/client/providers/providerUtilities.ts	94.44% <0%> (-5.56%)	⬇️
...rc/client/debugger/PythonProcessCallbackHandler.ts	68.09% <0%> (-0.33%)	⬇️
src/client/debugger/Main.ts	67.16% <0%> (+0.24%)	⬆️
src/client/providers/signatureProvider.ts	90% <0%> (+0.71%)	⬆️
src/client/providers/completionSource.ts	98.14% <0%> (+1.53%)	⬆️
src/client/providers/symbolProvider.ts	86.53% <0%> (+1.92%)	⬆️
src/client/providers/jediProxy.ts	80% <0%> (+3.82%)	⬆️
src/client/languageServices/jediProxyFactory.ts	81.81% <0%> (+4.54%)	⬆️
src/client/common/logger.ts	63.15% <0%> (+10.52%)	⬆️

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[DonJayamanne]

You probably didn't see my message #2068 (comment)

[d3r3kk]

@DonJayamanne I did. Have I missed something?