-Correction of the EveIcon class : the items now fully works

-Total rename of all the EveIcons to follow the same pattern the Icons
followed

-Creation of the SkillDisplay class, extending a JButton that will be
used in the skillSheet under the CharDisplay to display the basic
informations about the skill it will be created with, such as but not
limited to : the ID, sp on it and the level. Of course it still cannot
fetch the skills names so there is still thoses ugly IDs displayed.

-Refactor of the code a little

-Finished list of the EveIcons.java enum