Add information about Linux GFX environnement in FC info
Created by: 0penBrain
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Branch rebased on latest master git pull --rebase upstream master
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Unit tests confirmed to pass by running ./bin/FreeCAD --run-test 0
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Commit message is well-written
Add some useful information about the user desktop environment (mainly Linux environments are concerned) when FC info are copied to clipboard with the dedicated button of the about dialog. This pull request replaces patch proposed in issue #3884 (with QString::FromAscii replaced by QString::FromLatin1 as been made obsolete in Qt5).