tuna 0.0.2

Tuna-bles for live-tweaking of variables, for games and other applications.
Documentation 
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# tuna

Tuna is a tool for managing CVARs during game development, as a set of global
global variables, on which manipulation can be built.

At the core, the goal of tuna is to be *easy* to use, while avoiding unsafe
code.

This is how you use it:

``` rust

const ENABLE_LOGGING: tuna::Boolean = tuna::Boolean::new("logging", "enable", false);

fn main() {
    ENABLE_LOGGING.register();

    loop {
        if (ENABLE_LOGGING.read()) {
            eprintln!("looping once");
        }
    }
}
```

If you enable the `auto-register` feature, you can skip the first register call
at some performance cost.

Note that `tuna` is a work in progress! I'm working on it due to a need, but I
want to dogfood it while I build it - not build a whole thing on its own.

## Alternatives:

* [cvar](https://crates.io/crates/cvar) - much more customizable, less batteries-included