Update types.ts

[Swoorup]

• Make internally updated properties optional.
• Add built-in Spline and Candle overlay types.

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[Swoorup]

Why "Spline" | "Candles" | string; instead of string? It can be literally any type/

Discoverability, and autocompletion of the built-in types. Even though "Spline" | "Candles" | string; is the same as string, ides can give you hints on what the possible types are.

Btw I have changed such that you have BuiltInCandleOverlay which restricts both the type and the shape of the data later.

[Swoorup]

[C451]

Ok, will look into