QScintilla: pushed required QScintilla version to 2.11.1.

install.py: added code section to check for and install optional packages (like pyqt5-tools).

Updated translations.

Editor: added support for TOML files.

Globals: removed some obsolete code.

Updated the way the path to Qt tools is determined.

install script: changed minimum version for Qt/PyQt to 5.12.0.

changelog: started the changelog for the next release.

Created global tag <release-20.10>. maintenance

Merged with default branch to prepare a new release. maintenance release-20.10

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eric ide