**Describe the solution you'd like**

Make chainsaw dealing more damage with slower attack speed, for it to be more realistic and fit well with vanilla minecraft axes. I suppose it should have attack damage of, like, 10 and so the attack speed near 0.8 for basic variant and so on for advanced ones. And about drill... well, i suppose it should have attack damage similar to pickaxe, but faster attack speed (like you can actually drill enemy). If you don't have enough time to bother on that i can arrange a pull request with that tweaks.

P.S. I suppose that sapphire, peridot and ruby tools may need some rebalance to, but I have not yet formed a clear opinion on that

P.P.S. Excuse my English, it might be not really good sometimes

Already done by 38aaeab