Restore command (#593)

Add waiting for changes to config file

Add max size for config files

Restore files

Restore database file

Expose migrate to

Move init stuff to seperate package

Add restoring config file

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/api/pulls/593

pkg/db/dump.go

@@ -40,3 +40,15 @@ func Dump() (data map[string][]byte, err error) {
 
 	return
 }
+
+// Restore restores a table with all its entries
+func Restore(table string, contents []map[string]interface{}) (err error) {
+
+	for _, content := range contents {
+		if _, err := x.Table(table).Insert(content); err != nil {
+			return err
+		}
+	}
+
+	return
+}