converter script: Parameterized processor names trip up converter script

Marlin seems to support the following construct (taken from [`CLICPerformance/fcceeConfig/fccReconstruction.xml`](https://github.com/iLCSoft/CLICPerformance/blob/master/fcceeConfig/fccReconstruction.xml)):

```xml


10

```

this gets converted into
```python
algList.append(MyDDCaloDigi_${CalorimeterIntegrationTimeWindow}ns)
```

which is an obvious syntax error in python.

Start with the converter script that turns the shown Marlin processor declaration into an algList.append entry, using the XML example in the issue as the reproduction. Trace how processor names containing ${...} are emitted; done means the parameterized name no longer produces invalid Python while ordinary processor names still convert correctly.

Written by the indexing model from the issue text.