Use implicitHCount in SMILES for all cases

**Background**
Currently implicitHCount is used only for the specific cases when an atom with implicitHCount is connected to aromatic ring.
In all other cases the radical property is modified to compensate missing hydrogens. For instance in the following SMILES: [C]1-[C]=[C]-[C]=[C]-[C]=1 the carbon atoms got modified radical property.

**Solution**
Avoid the workaround with radicals and use implicitHCount where it's possible instead. Radicals should appear only when molecule is written into a mol-file.