Add functions hero:is/set_invincible()
Created by: christopho
We need to be able to make the hero temporarily invincible, optionally with his sprites blinking for a few seconds, like after being hurt.
hero:is_invincible() hero:set_invincible([invincible, [delay]]) hero:is_blinking() hero:set_blinking([blink, [delay]])
Being invincible and having the sprites blinking are two independent properties because sometimes we need one property without the other. Example: an equipment item that makes the hero temporarily invicible.
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