update uncrustify file for picongpu

This file is fully testet and create compileable code if we reformate our full project with this rules.

One point we must change is: move documentation of variables over the value (e.g. in *.param)

```C++
const float_X CELL_WIDTH = float_X (SI::CELL_WIDTH_SI / UNIT_LENGTH); //normalized to UNIT_LENGTH
```
generated code by uncrustify

```C++
 const float_X CELL_WIDTH = float_X( SI::CELL_WIDTH_SI / UNIT_LENGTH );   /* normalized
                                                                           * to
                                                                           * UNIT_LENGTH */
```

It should by something like this:

```C++
/* normalized to UNIT_LENGTH */
const float_X CELL_WIDTH = float_X (SI::CELL_WIDTH_SI / UNIT_LENGTH); 
```