plClearOpts: Clear internal option table info structure

`plClearOpts`: Clear internal option table info structure
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#### `plClearOpts`: Clear internal option table info structure

`plClearOpts (` | `)`;

Clear the internal options table info structure. This removes any option added with `plMergeOpts` as well as all default entries.

This function returns 0 on success.

This function is not used in any of our C examples.

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