Work on Character Skill System.
Updated GM giveskill function to check for existence of skill.
Updated GM giveskill function to check for level of skill (to avoid downgrade).
Added functions, DB table, and all code to enable skill history.
Added code to enable pause/resume of skill training.
Moved character skill database code from InventoryDB.cpp to CharacterDB.cpp
Updated evemu_dynamic_dump.sql for new tables for skill history, skillqueue end time, and pausing skill queue.
Removed unused code in Skill.cpp, CharacterDB.cpp, and Character.cpp
minor rework to Character::UpdateSkillQueue() to enable skill history and more accurate skill training.
Added code to resemble persistent skill training.

Signed-off-by: Allan <zhyrohaad@bellsouth.net>