Incremental naming of copied files/folders

[arcticicestudio]

In VS Code version 1.37 the automatic incremental naming for copied files that include numbers has been (silently) removed, but than added back as explorer improvement in version 1.38 with two configuration options to either add a copy suffix or use a smart strategy. The second one adds a number at the end and if some number is already part of the name, it tries to increase that number. This reflects the behavior from VS Code versions <1.38 and will therefore be used.