generators: Use single function for all templates

This commit makes use of a common function for all template parsing and page
writing. The behaviour is controlled by the "item" argument passed in. This
allows us to have a single code that generates code for list of items as well
as for a single item. In the future, this can be used for e.g. combining
thumbnails and large images on the same page.

Other than that this commit also brings several other changes:
 - further clarification of theming setup XML file
 - <protected_thumbnail> tag has been moved out of the <album> structure into
   the <index> structure where it functionally belongs. Only whole albums can
   be protected and the substitute thumbnail is displayed on index pages.
 - position marker format has been broken out to a constant
 - added few more FIXMEs to mark places that will change soon
 - some template variables have been renamed

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