Add styles output to info command

Adds the ability to list all available styles in LAMMPS with:

```
info styles
```

Each style can also be printed separately using one of the following:

```
info atom_styles
info integrate_styles
info minimize_styles
info pair_styles
info bond_styles
info angle_styles
info dihedral_styles
info improper_styles
info kspace_styles
info fix_styles
info compute_styles
info region_styles
info dump_styles
```