Fix whitespace in plugin skeleton templates (code style)

First go at unifying the plugin wizard and the dev plugin

This moves the skeleton files to this repository. For easier editing and
syntax highlighting, the skeleton files now have their proper endin

First go at unifying the plugin wizard and the dev plugin

This moves the skeleton files to this repository. For easier editing and
syntax highlighting, the skeleton files now have their proper endings.

All skeleton processing is done in the Skeletor class which is
independent from the DokuWiki installation.

The next task is to add the web interface.

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