Rename Block->canBeBrokenWith() to isCompatibleWithTool() and add documentation

This name better describes it. "can be broken with" implies that items which this returns false for cannot destroy the block at all, which is incorrect. What this actually returns is whether the item is the best tool to use to break the block.

src/pocketmine/block/LapisOre.php

@@ -52,7 +52,7 @@ class LapisOre extends Solid{
 	}
 
 	public function getDrops(Item $item) : array{
-		if($this->canBeBrokenWith($item)){
+		if($this->isCompatibleWithTool($item)){
 			return [
 				ItemFactory::get(Item::DYE, 4, mt_rand(4, 8))
 			];