Make class names consistent, match them with readme.md

[marcinn]

• Some classes are suffixed with Ability or Behaviour words, others not.
• Some classes have slightly different names than in readme.md
• Remove "behaviours" for "abilities" only. Two groups with same or very close meaning are misleading.
• Consider introducing distinction between abilities (i.e. Health) and logic based on the ability (i.e. HealthRegeneration)