File List replacement with NewTools FileBrowser

[hernanmd]

Important

This PR first needs https://github.com/pharo-spec/NewTools/pull/880 to be integrated

The related failing tests failing until the above PR gets integrated into the image are:

• CodeExporter class>>#writeSourceCodeFrom:baseName:isSt:
• Object>>#fuelOut

Tasks done

• Remove Morphic file list registration from BasicTools
• Clean and replace all FileDialogWindow references.
• Clean all external FileList references.
  • Implies no more FileListGrid and FileListGridNode references.
  • Implies no more FileDirectoryWrapper references.
  • Remove fileList senders.
• Remove 'Tool-FileList-Tests'
• Moved String>>#asFileName to NewTools since it is used by fuelOut and CodeExporter (in NewTools repository)