Dual Specialization module for cmangos vanilla and tbc cores which will allow the players to purchase and change between specializations

The dual specialization npc will be located in Stormwind Mage Tower and in Orgrimmar Valley of Spirits.

Classic and TBC

1. Follow the instructions in https://github.com/davidonete/cmangos-modules?tab=readme-ov-file#how-to-install
2. Enable the BUILD_MODULE_DUALSPEC flag in cmake and run cmake. The module should be installed in src/modules/dualspec
3. Copy the configuration file from src/modules/dualspec/src/dualspec.conf.dist.in and place it where your mangosd executable is. Also rename it to dualspec.conf.
4. Remember to edit the config file and modify the options you want to use.
5. Lastly you will have to install the database changes located in the src/modules/dualspec/sql/install folder, each folder inside represents where you should execute the queries. E.g. The queries inside of src/modules/dualspec/sql/install/world will need to be executed in the world/mangosd database, the ones in src/modules/dualspec/sql/install/characters in the characters database, etc...

To remove the dual spec from your server you have multiple options, the first and easiest is to disable it from the dualspec.conf file. The second option is to completely remove it from the server and db:

1. Remove the BUILD_MODULE_DUALSPEC flag from your cmake configuration and recompile the game
2. Execute the sql queries located in the src/modules/dualspec/sql/uninstall folder. Each folder inside represents where you should execute the queries. E.g. The queries inside of src/modules/dualspec/sql/uninstall/world will need to be executed in the world/mangosd database, the ones in src/modules/dualspec/sql/uninstall/characters in the characters database, etc...