Port elementalist to alpha 2 (#188)

* Add template

* Basic features

* Remove eldritch from pairings

* Actually name the capstone

* Move into core

* Formatting

* Copy-paste element pairings

* Clean up spell metadata

* Adapt Twistings

* Remove thoughtscour

* Revise Detonation variants

* Revise Meld spells

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Co-authored-by: Alice Cecile <[email protected]>

rulebook/src/character-options/classes/elementalist/combat_feats.md

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+# Combat Feats
+
+## Master of the Elements
+
+**Effects:** Gain access to a second elemental pairing. You gain access to the twists and hybrid Meld spell associated with that pairing, and any features that depend on this . Learn two additional powers.
+Detonating only resets the elemental exposure for the pair of elements that was detonated.
+
+When you gain this combat feat, sacrifice an exploration feat.
+
+## Shaped Charge
+
+**Effects:** When you use your Detonation feature, select one of the following shapes for the effect:
+
+- a 10-foot radius sphere centered on yourself
+- a 20-foot cone centered on yourself, in a direction of your choosing
+- a 40-foot x 5 foot line, starting at yourself, in a direction of your choosing
+
+## Power Cycle
+
+**Effects:** Whenever you would detonate, you may choose to gain 3 essence rather than the effect listed in your elemental pairing.
+
+## Gentle Touch
+
+**Effects:** At the start of each of your turns, you may change your exposure by 1 in any direction.
+
+### Power Siphon
+
+**Effects:** The first time each turn that you hit a creature with a Shove, Strike or Grapple attack, gain the benefits of the Recover action.
+
+### Extremism
+
+**Effects:** Whenever you cast a spell, change your exposure by 2 rather than 1. Whenever you land a critical hit, change it by 3 rather than 2.
+
+### Hair-Trigger Detonation
+
+**Effects:** The maximum number of stacks of exposure that you can have is reduced to 5. Any effects (such as your Detonation class feature) that trigger at 7 stacks of exposure now trigger at 5 instead.
+
+### Perfect Balance
+
+**Effects:** While you are at 0 stacks of exposure, gain the enhanced version of all spells. Their critical hit threshold is reduced by 4.
+
+### Paradoxical Effect
+
+**Effects:** Whenever you gain exposure, you may choose the direction (but not amount) of the exposure gained.
+
+### Knife's Edge
+
+**Effects:** At the end of each of your turns, if you are at 4 or more stacks of exposure, gain an additional AP.
+
+### Alternating Detonation
+
+**Effects:** Whenever you detonate, if it is not the same element as your last detonation, any attack made is automatically a critical if it hits.
+
+### Spellblade
+
+**Effects:** After you hit a creature with a basic attack, reduce the AP cost of your next spell by 1. This effect can stack.

rulebook/src/character-options/classes/elementalist/exploration_feats.md

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+# Exploration Feats
+
+## Feat title
+
+**Prerequisites:** Prerequisites for feat to be performed.
+
+**Effects:** Feat effect description