Function elementalist::player::plugin::subtract_health

fn subtract_health(
    player_health: Query<'_, '_, &mut Health, With<PlayerAvatar>>,
    player_xp: Query<'_, '_, &mut Xp, With<PlayerAvatar>>,
    keyboard_input: Res<'_, Input<KeyCode>>
)

System that subtracts 1 from a the players health when the ‘H’ key is pressed.

It also adds 1 to the player’s experience points when the ‘X’ key is pressed.

This is just a test system to see if the player’s health and experience points are being updated correctly.