Added a way to limit xp used with /cenchant

[Starmania]

This is useful when you want to use as little xp level as possible.

How did I tested this pr:

[23:05:15] [Render thread/INFO]: [CHAT] Player RNG cracked: c1700935c5bb

[23:05:17] [Render thread/INFO]: [CHAT] maxExperienceConsumed has been set to 1.

[23:05:23] [Render thread/INFO]: [CHAT] Starting enchantment manipulation. Cancel
[23:05:23] [Render thread/INFO]: [CHAT] Item throws needed: 8 (about 0.4 seconds)
[23:05:23] [Render thread/INFO]: [CHAT] Bookshelves needed: 5
[23:05:23] [Render thread/INFO]: [CHAT] In slot: 1
[23:05:23] [Render thread/INFO]: [CHAT] Enchantments on item:
[23:05:23] [Render thread/INFO]: [CHAT] - Aqua Affinity

[23:05:24] [Render thread/INFO]: [CHAT] maxExperienceConsumed has been set to 3.

[23:05:27] [Render thread/INFO]: [CHAT] Starting enchantment manipulation. Cancel
[23:05:27] [Render thread/INFO]: [CHAT] Item throws needed: 5 (about 0.25 seconds)
[23:05:27] [Render thread/INFO]: [CHAT] Bookshelves needed: 13
[23:05:27] [Render thread/INFO]: [CHAT] In slot: 3
[23:05:27] [Render thread/INFO]: [CHAT] Enchantments on item:
[23:05:27] [Render thread/INFO]: [CHAT] - Power III
[23:05:27] [Render thread/INFO]: [CHAT] - Aqua Affinity

I can rename the config option to getMaxExperienceLevelConsumed or something like that but it's becoming pretty long. As you want.

[Earthcomputer]

This is the same as which slot to use, so could it be renamed to maxEnchantSlot or something? I think that's clearer

[Starmania]

Yeah, why not... Naming variables is the most difficult thing to do.