…ds compatible.

A single async initializer must also be proxied

Collision: opts.stamp must be coerced to CollisionStamp in reducer
Collision: Add hasAggregates(), getAggregates() and setAggregates() to Collision stamp
Collision: Make collision composer a named function
Collision: Add isAggregateDomainItem(), getDomainItemAggregates(), setDomainItemAggregates()
Collision: Simplify make*ProxyFunction()
Collision: Initializers are now aggregated properly
Collision: Tests now check aggregate arrays are properly formed

…and setAggregates() + tests

Collision: Remove *.d.ts that was accidentally committed
Collision: Re-enable prettier/prettier in index.ts and reformat to match rules
Collision: In context @typescript-eslint/no-shadow added

Collision: Rename validateHasGetSetArguments() to validateDomainAndItemName()
Collision: Revert type changes in @stamp/compose

Collision: Bump Typescript to >= 3.8.0
Collision: Fix named/required use of if (this?.compose) since it never returns false
Collision: Add return types to two functions in collision/index.ts
Collision: Update ComposeProperty repeated declaration in shortcut/index.ts
Collision: Update collision settings in __tests__/privatize-plus-collision.js

…ring to Stamp specification)

Collision: Rejig if (this?.compose...) to if (isStamp(this)...)

… of the chain

… what's there already

Allow 'this' to be stamp or descriptor for collisionGetAggregates() and collisionSetAggregates()