Get correct spell ID for spells in the spellbook.

Get correct spell ID for spells in the spellbook.

When looping through the spellbook, GetSpellBookItemName() doesn't always
return the name of the spell that's currently showing in the spellbook;
instead it might show the underlying spell that may have been replaced by
a new spell by either talents, glyphs, Symbiosis, etc.

Use GetSpellLink() instead to get the hyperlink of the actual spell that's
showing in the spellbook and parse it to determine the correct spell ID
and spell name.  Associate both the original (replaced) spell ID and the
the true spell ID with the correct spell name as some scripts, e.g.
Leafkiller's feral script, reference the spell using the replaced spell
ID.

Fix by @ShmooDude and closes his tickets 282 and 283.

git-svn-id: svn://svn.curseforge.net/wow/ovale/mainline/trunk@1083 d5049fe3-3747-40f7-a4b5-f36d6801af5f