[s2091] Big rename of creature_template fields.

Also renamed core part to have same field name than sql.

Added new fields will be used in near near future for new stats system.

Please refer to http://cmangos.net/thread-431.html for more informations.

Thank to all involved on this.
[s2092] Loading/reloading classlevelstats.

Simple function to load and reload creature_template_classlevelstats table.
Also add getter.
Part 2/3 of new stats system.

Thank to @Schmoozerd.
[s2093] Implement new stats system for Health and Mana. Core now suport health and mana from new stats system. To make it work you'll need to have DB part also wich is not yet public nor ready for wotlk.

So till that DB will be released health and mana will be prossessed like as usual.

Thank to @X-Savior for making it possible.
Thank to @Schmoozerd for his code improvement.