Shears speed scales

<p>Higher tier shears actually break leaves faster now.</p> <p>The new values are below. They can be easily modified to suit your preferences.</p> <p>- Copper: x1<br />- Bismuth and tin bronze: x1.5<br />- Black bronze: x2<br />- Gold and silver: x2.5<br />- Iron: x3<br />- Meteoric iron: x3.5<br />- Steel: x4</p>