Restore skipComments option on reinitialization of the data process…

[Mati365]

Suggested merge commit message (convention)

Fix (html-support): Comments are no longer lost when FullPage plugin is added after the HtmlComment plugin.

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Additional information

The HtmlComment plugin sets skipComments to false but FullPage reinitializes the processor and resets this flag.

Reported in this comment

[niegowski]

This approach would not be safe in the future if we added more options. I'd move the editor.data.processor assigned to the plugin constructor the same as in the GFMD plugin so other features can set options on a single data processor instance later.