Implement resetting for one preference

[koppor]

For resetting preferences, the handling of the preference objects needs to be changed.

This issue describes the steps to do.

Note

We created sub issues for each prefernce

PR showing the changes for WorkspacePreferences: #13894

In JabRefGui/CliPreferences remove (but keep the values in mind)

In XXXPreferences class

• Add private default constructor (use the values from the step before)

• Add getDefault method

• Add setAll method

In JabRefGui/CliPreferences class

• Add fromBackingStore method (Note that the screenshot has lowLevelApi, but we want BackingStore

• Modify getXXXPreferences method

• Add to clear / importPreferences method

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• Internal note As soon as this issue is solved, we need to create sub issues for JabRefCliPreferences.

Pick one preference from

jabref/jabgui/src/main/java/org/jabref/gui/preferences/JabRefGuiPreferences.java

Lines 227 to 246 in 92cc09d

	private EntryEditorPreferences entryEditorPreferences;
	private MergeDialogPreferences mergeDialogPreferences;
	private AutoCompletePreferences autoCompletePreferences;
	private CoreGuiPreferences coreGuiPreferences;
	private WorkspacePreferences workspacePreferences;
	private UnlinkedFilesDialogPreferences unlinkedFilesDialogPreferences;
	private ExternalApplicationsPreferences externalApplicationsPreferences;
	private SidePanePreferences sidePanePreferences;
	private GroupsPreferences groupsPreferences;
	private SpecialFieldsPreferences specialFieldsPreferences;
	private PreviewPreferences previewPreferences;
	private PushToApplicationPreferences pushToApplicationPreferences;
	private NameDisplayPreferences nameDisplayPreferences;
	private MainTablePreferences mainTablePreferences;
	private ColumnPreferences mainTableColumnPreferences;
	private ColumnPreferences searchDialogColumnPreferences;
	private KeyBindingRepository keyBindingRepository;
	private CopyToPreferences copyToPreferences;
	private NewEntryPreferences newEntryPreferences;
	private DonationPreferences donationPreferences;

and handle it.