Werk #1500: Preventing livestatus injections in different places

In some places strings provided by the users, e.g. by filling values into a form, are used to construct livestatus queries. This is, for example, done when filtering views or executing commands. Previous versions were directly using the strings provided by the user without escaping or filtering characters which could lead into some trouble. This has been fixed now. The strings provided by the user are now filtered before using them in livestatus queries. For the moment the only implemented action is to remove all newline (\n) characters from the values to prevent injections of non intended livestatus queries / commands.

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