Prepared new release. release-4.0.0

Implemented some code simplifications.

Removed support for outdated eric6 versions.

Updated copyright for 2021.

Changed code to not use the OSError aliases (IOError, EnvironmentError, socket.error and select.error) anymore.

Created global tag <release-3.1.0>.

Changed calls of exec_() into exec(). release-3.1.0

Created global tag <release-3.0.0>.

Removed support for Python2. release-3.0.0

Created global tag <release-2.1.0>.

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