Do we want active rules to be listed as bools

[JakeRoggenbuck]

Two ideas:

Currently, we store rules like this and access them like this...

// Store like this
impl Default for Config {
    fn default() -> Config {
        Config {
            // ...
            active_rules: vec![
                State::BatteryLow,
                State::LidClosed,
                State::Charging,
                State::CpuUsageHigh,
            ],
        }
    }
}

// Access like this
if self.config.active_rules.contains(&State::Charging) && self.charging {
    state = State::Charging;
}

We check .contains more than we need to because the config is only read once at the start and should not be changed. We could do one of two things. (A) change the config to be bools to reduce calls. This would mean each rule has a ac_charging_rule = true instead of including "ac_charging_rule" to the active rules list.
Alternatively (B), we could read the rules from the list and have hidden config bools that are set when the list is set.

What do y'all think? @Shuzhengz @Camerooooon