Changed Flux Mining mechanics

Previously, Flux Mining would get unlocked at a specified level with a
specified chance. Once unlocked, the player would have no control over
this ability and some players complained they would like to be able to
turn it on and off.

By adding a new furnace recipe, to craft a special pickaxe - a Flux
Pickaxe - this issue is solved. If a player doesn’t want to use Flux
Mining, they simply shouldn’t mine using a Flux Pickaxe.

Crafting a Flux Pickaxe is simple, just place one of the vanilla
pickaxes in a furnace and cook it up.

Every time the ability is successful, extra durability damage is dealt
to the tool. Just like with other abilities.

Adds #2320
Fix bug where no XP was granted when Flux Mining

Fixes #2359
Fixed bug where MobHealthbarTypes were not saved
Only show the scoreboard tips a couple of times

We can assume a player knows how scoreboards work after showing them
the tips a few times across multiple login sessions

Adds #1833
Added new active ability, Charge, to Taming