Adria refill mana as mod

[yuripourre]

This PR turns the gameplay toggle to refill mana when talking to Adria into a mod.

When I created the PR to add this feature it was a huge controversy (and of course I understand and agree with @qndel and others). Back then we didn't have the lua structure in place so now is much easier to make it as a mod.

#1136

At the same time I can learn more about how to make mods and create mods that can serve as example for other devs.

[AJenbo]

it seems odd why this PR would break the demo, the feature was not enabled and the player isn't even in town.

[yuripourre]

it seems odd why this PR would break the demo, the feature was not enabled and the player isn't even in town.

I think it's because I removed the "Adria Refil Mana" from the saved configurations:

WriteByte(out, static_cast<uint8_t>(*options.Gameplay.adriaRefillsMana));

https://github.com/diasurgical/DevilutionX/pull/8371/files#diff-9180dcad034212a97d5acf1d39ec2ccc73cfeb0353b6102ef73b40a34aa2b6bfL234

[yuripourre]

@AJenbo fixed!