Better Balanced Willow

Rebalances to Willow to make her a better character and make her special craftables more useful to other characters. The changes are as follows. Fully Immune to fire damage. (From 50% resistance.) Other characters can cook with Willows Lighter. Willows Lighter costs 1 rock, 1 gold nugget. (From 1 rope, 3 petals, 1 gold nugget.) Bernie costs 1 Beefalo wool, 2 silk. (From 2 beefalo wool, 2 silk, 2 beard hair.) Bernie lasts 1 day on ground until fading away. (From 3.) Note: Currently characters added by a mod are unable to cook on Willow's Lighter. Interested in the reasoning for the changes? http://steamcommunity.com/workshop/filedetails/discussion/1052306676/1457328927839645006/ Please note that these changes are balanced for cooperative play and not other gamemodes such as The Forge.