Multi-line defaults in IRIS Properties cause ObjectScript compilation errors

Having multi-line default values for IRIS Properties causes objectscript syntax errors:

For example:
```
iris_property_one = IRISProperty(default = """this is a multiline default property
to demonstrate an error
""", description="property desc")
```

Doesn't get registered due to:

```
ERROR #5559: The class definition for class 'QuickStart.CustomBS' could not be parsed correctly, possibly due to non-matching {} or () characters or a missing ; character or non-matched /* */ blocks. Edit the class and correct the problem.
> ERROR #5030: An error occurred while compiling class 'QuickStart.CustomBS'
```

The reason is the incorrect ObjectScript Syntax:
```
Property PropSetting0 As %VarString [InitialExpression = "this is a multiline default property
to demonstrate an error
"];
```

While this is a fairly niche issue, it was difficult to debug because the python code had valid syntax.