Player::isClimbing
This property returns true or false of player climbing state.
Note: TypeScript types are wrong - this is not a boolean, but a method.
Example
```js let playerIsClimbing = player.isClimbing() if (playerIsClimbing)
player.outputChatBox('You are climbing right now!');
else
player.outputChatBox('You are not climbing right now!');
```