improve CSI text output

[hokb]

Currently, the text representation for ILArray return values/variables is behind of what it could be. The CSI displays the type name only. ToString() should be called on the types instead, similar to the C# immediate window.
Another problem: everything is displayed as a single line. Linebreaks in the string are automatically escaped. This way, the nice and useful matrix/array display of ILArray is pretty much useless.
Calling Console.Write, however allows for multiple lines output.