Make FileCommander setup screen a more standard setup

[prl]

Remove the old help information from FileCommanderConfigScreen and rework it so that it is compatible with a standard Setup screen skin.

Add descriptions to setup items.

Remove the old FileCommanderConfigScreen from the skins.

[Peter Urbanec]

Fix bug #669: Make FileCommander setup screen a more standard setup

Refactor FileCommander.FileCommanderConfigScreen to inherit from Screens.Setup and load its setup definitions from FileCommander/setup.xml.

Add setup.xml with setup definitions.

Change the definition of config.plugins.filecommander.path_default from ConfigText to ConfigDirectory so that it doesn't respond to text input, displays an empty string as "List of storage devices", and uses that as the default path.

Fix bug in goDefaultfolder that when config.plugins.filecommander.path_default is not set, it doesn't go to "List of storage devices" when 5 (Go to default folder) is pressed.

Change the definition of goRestart() to allow for the fact that Setup can call close() without arguments.

When setting Default folder, use LocationBox instead of MovieLocationBox, because MovieLocationBox restricts the directories that can be set for Default folder, and the FileCommander isn't restricted from examining any directories.

→ <<cset f8fbf7d581ad>>