BddUtils.valuationToStates may crash due to initializing a list with negative initial size
Stack trace:
```
java.lang.IllegalArgumentException: Illegal Capacity: -2147483648
at java.base/java.util.ArrayList.<init>(ArrayList.java:160)
at org.eclipse.escet.common.java.Lists.listc(Lists.java:220)
at org.eclipse.escet.cif.bdd.utils.BddUtils.valuationToStates(BddUtils.java:473)
```
The problem is in the following code:
```
// Get list to store resulting states, with a decently-approximated initial size.
ListProductIterator<Object> stateIter = new ListProductIterator<>(valuesPerVar);
Optional<Long> stateCountOrOverflow = stateIter.getResultSize();
long cappedStateCount = stateCountOrOverflow.orElse(Long.MAX_VALUE);
int approxStateCount = (int)cappedStateCount;
List<Map<CifBddVariable, Object>> states = listc(Math.min(approxStateCount, maxStateCount));
```
The `long` to `int` cast may lead to negative values.
issue