* [Commands] Add #show special_abilities
# Notes
- Allows operators to see what special abilities an NPC has.
- Move special ability values to `common/emu_constants.h`.
- Add `EQ::constants::GetSpecialAbilityMap()` and `EQ::constants::GetSpecialAbilityName()`.
- Add `NPC::DescribeSpecialAbilities(client)` to describe special abilities to a specified client.
# Images
* Update npc.cpp
