fix syntax plugin loading

It turns out our Syntax plugins never implemented the PluginInterface
(though they did use the PluginTrait). With our stricter type checking
in the plugin loader, these plu

fix syntax plugin loading

It turns out our Syntax plugins never implemented the PluginInterface
(though they did use the PluginTrait). With our stricter type checking
in the plugin loader, these plugins did not longer load.

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code style: line breaks

code style: operator spacing

codestyle adjustments: class declaration braces

Apply rector fixes to inc/Parsing

Remove the htmlok and phpok embedding options

Both options have grave security implications and novice users seem to
ignore advice about them. In the last decades I never came across a wiki
that had

Remove the htmlok and phpok embedding options

Both options have grave security implications and novice users seem to
ignore advice about them. In the last decades I never came across a wiki
that had legitimate use of these options.

If someone needs the functionality, it can easily be added back using a
plugin. But I prefer to give users one less option to shoot themselves
in the foot.

Removal of the translations for the config strings can follow after this
has been merged.

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Public access to patterns in external link parser