Initial work on wasm scripting backend

src/script_implementations/wasm/mod.rs

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+/// The export registry module deals with registering all functions we require in WebAssembly.
+mod export_registry;
+pub(crate) mod extern_ref;
+/// The script module deals with the actual running of WASM functions.
+pub mod script;
+/// The script resolver deals with the loading of scripts.
+pub mod script_resolver;
+
+/// The WebAssemblyScriptCapabilities define which functions are implemented on a script. This allows
+/// us to not call a function if we do not need to.
+#[derive(Debug, Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Hash)]
+#[allow(missing_docs)]
+pub enum WebAssemblyScriptCapabilities {
+    None = 0,
+    Initialize = 1,
+    OnStack,
+    OnRemove,
+    OnBeforeTurn,
+    ChangeAttack,
+    ModifyNumberOfHits,
+    PreventAttack,
+    FailAttack,
+    StopBeforeAttack,
+    OnBeforeAttack,
+    FailIncomingAttack,
+    IsInvulnerable,
+    OnAttackMiss,
+    ChangeAttackType,
+    ChangeEffectiveness,
+    BlockCritical,
+    OnIncomingHit,
+    OnFaintingOpponent,
+    PreventStatBoostChange,
+    ModifyStatBoostChange,
+    PreventSecondaryEffects,
+    OnSecondaryEffect,
+    OnAfterHits,
+    PreventSelfSwitch,
+    ModifyEffectChance,
+    ModifyIncomingEffectChance,
+    OverrideBasePower,
+    ChangeDamageStatsUser,
+    BypassDefensiveStat,
+    BypassOffensiveStat,
+    ModifyStatModifier,
+    ModifyDamageModifier,
+    OverrideDamage,
+    OverrideIncomingDamage,
+    ChangeSpeed,
+    ChangePriority,
+    OnFail,
+    OnOpponentFail,
+    PreventRunAway,
+    PreventOpponentRunAway,
+    PreventOpponentSwitch,
+    OnEndTurn,
+    OnDamage,
+    OnFaint,
+    OnAfterHeldItemConsume,
+    PreventIncomingCritical,
+    ModifyCriticalStage,
+    OverrideCriticalModifier,
+    OverrideSTABModifier,
+    ModifyExperienceGain,
+    DoesShareExperience,
+    BlockWeather,
+    OnSwitchIn,
+    ModifyOffensiveStatValue,
+    ModifyDefensiveStatValue,
+}