*
* @param skillType Skill being used
* @param xp Experience amount to add
*/
public void registerXpGain(SkillType skillType, float xp) {
gainedSkillsXp.add(new SkillXpGain(skillType, xp));
rollingSkillsXp.put(skillType, getRegisteredXpGain(skillType) + xp);
}