fix: ThreeEvent should not include initMouseEvent

[bbohlender]

Currently, the types for all onClick, ... events expose the initMouseEvent function. The Properties type definition has the goal to remove all functions, but it only removes functions with one parameter. Therefore the initMouseEvent is not removed and the type is forwarded to the event, even though no initMouseEvent function exists on the actual event object.

This PR fixes that and uses a more modern way of filtering entries in the map using as supported from typescript 4.1 (4 years ago). https://www.typescriptlang.org/docs/handbook/2/mapped-types.html#key-remapping-via-as

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[CodyJasonBennett]

Nice find.