GetMaterialCommand and GetTypologyCommand filter should be case insensitive

The nature of the Materials library means that having to search for 'concrete' means having to run the search twice, for 'concrete' and 'Concrete' to find all relevant materials. I recommend that the filter is made case insensitive to allow such searches to find all relevant results with a single command.

e.g. line 85 of GetMaterialCommand could be

```C#
return materialObjects.Where(m => (m as IEnergyMaterialOpaque).Name.ToLower().Contains(command.Filter.ToLower())).ToList();
```

Please discuss if there are any use cases where case sensitivity is necessary.