Add Specialization Check Methods to Player

[iThorgrim]

This Pull Request introduces four new methods to the Player class in order to check for a player's specialization:

• HasTankSpec: This method will return true if the player has a Tank Specialization, false otherwise.
• HasMeleeSpec: This method will return true if the player has a Melee Specialization, false otherwise.
• HasCasterSpec: This method will return true if the player has a Caster Specialization, false otherwise.
• HasHealSpec: This method will return true if the player has a Heal Specialization, false otherwise.

The code for these methods has already been tested and works as expected. You can use them by calling Player:HasTankSpec(), Player:HasMeleeSpec(), Player:HasCasterSpec(), Player:HasHealSpec() respectively.

Your feedback on this addition would be greatly appreciated.
Kind Regards,

Vaiocti (iThorgrim)