feat(Line2): allow points to be added/removed

[andretchen0]

Problem

After initial creation, additional points could not be added to Cientos' Line2 component. The on-screen component would not display the additional points.

Solution

Recreate the Line2 geometry to accommodate the additional points.

Problem

The defineExposed instance is undefined because here ...

<template>
  <primitive
    :ref="lineRef"
    :object="line"
  />
</template>

... :ref should be ref.

Solution

Remove the colon from :ref.

Meta

Closes #493

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