This allows code such as
```
if (dim == 1)
  DUNE_THROW_IF(order > 5, ...);
else
  DUNE_THROW_IF(order > 3, ...);
``

This reverts commit e54351e2.

It would be better if we could move classes only with
deprecation warning in place for a while.

This allows to refactor all those
```if(foo) {
throw bla;
}
```
blocks into ```DUNE_THROW_IF(foo, bla, "")```

- allows dumping of the process env
- csv output of memory usage stats
- exception handlers

with 3.8 we were seeing kinda weird constructs, i.e. in for loops