Allows shortening the grace period

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Notes:

• Customizable via mod settings menu
• Grace period should update if changed mid-game
• Grace period can not be increased above the normal value

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For modders:

• Mod has global name TweakableGraceDuration
• Hooks into lib/tweak_data/playertweakdata, lib/units/beings/player/playerdamage
• Has priority 0