[Feature] Add by spell name

[kalbert312]

Describe the feature

Adding spells by name to white/blacklist instead of ID will save headache of getting all spell IDs.

Describe the implementation

Enter a spell name, then the addon loops across all spell ids that match the name and adds the spell ids to the list.

[Krealle]

There is no direct API for getting spellIds from names (outside of player spells), so this would require iterating every single spellId in the game to find matches. Not too keen on this just yet, but might reconsider in the future.