Robotkernel

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- Fix issue where text strings feed to JSON displayed a warning
[datakurre]
- Fix JupyterLab context help support to work when clicked in the middlle of a keyword
[datakurre]
- Fix to close dangling Selenium connections
[datakurre]

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- Fix issue where ${CURDIR} was broken on Windows, because it contained path without
escaped path separators required by Robot Framework
[datakurre]
- Fix issue where suite variable listener reported errors when running robot suites,
because it tried to restore dictionary variables with empty value
[datakurre]

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- Fix issue where log and report links did not open on JupyterLab 1.0
[datakurre]

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- Move tutorials notebooks into notebooks folder
[datakurre]
- Fix WhiteLibrary autocompletion to suggest selectors with :-separator
instead of =-separator
[datakurre]

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- Fix remaining where keeping state of suite level variables between cell
executions since 0.12.0 caused regression by fixing the listener to ignore
all known built-in variables
[datakurre]

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- Fix issue where keeping state of suite level variables between cell
executions resulted in errors caused by outdated output directory
from the old variables
[datakurre]