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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moved all parsing related namespaces to their own

split out parser modes into their own files

This moves all the parser classes into their own namespace and files.
Next up are the handler classes.

I'm not sure about the namespace, yet. A nested na

split out parser modes into their own files

This moves all the parser classes into their own namespace and files.
Next up are the handler classes.

I'm not sure about the namespace, yet. A nested namepspace Parser\Modes
would probably make more sense... we'll see.

This also removes the duplicated coded in the Plugin mode. We now use
the plugin trait and can inherit from AbstractMode instead.

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moved _testing to _test