fixed possible nullptr dereference

* Fixed a switch() statement in InfoBoxHeroData::getValueText that
  could result in nullptr dereference. If 'type' was HERO_MANA and
  'hero' was nullptr, a fallthrough would occur to HERO_EXPERIENCE,
  where 'hero' would we be dereferenced.
* Fixed line endings.
Merge pull request #5 from janisozaur/develop

fixed possible nullptr dereference