Add a feature flag for logging about hudhook HOT 4 OPEN

The solution to this issue will be implemented like the rocket crate: by defining feature-flagged macros that reexport the existing macros from log if the feature is active, and do nothing otherwise.

from hudhook.

That's a great idea, thank you. General refactoring is already planned for a new minor release sometime in the near future, so this could very well be part of that.

from hudhook.

Decided to postpone this too for a later release because the implementation resulted quite tricky and I don't want to invest too much energy on it right now.

I leave a sketch of a possible solution here. It doesn't compile, tries to cloak the macros but it results in some weird scoping issues. I'd consider an alternative solution, if possible.

from hudhook.

Now that we have tracing, this might not be necessary and in fact could be dealt with by just setting up the subscribers.

@Jakobzs, you have worked on tracing, do you know how these two could be achieved and if my hypotheses are correct?

• Completely suppress logging (hypothesis: if you just don't depend on tracing-subscriber in your client, you don't pay any of the runtime cost of having tracing macros?)
• Filtering out all messages coming from hudhook (do some filtering when setting up tracing-subscriber on the client -- do you have a snippet of what this could look like?)

from hudhook.