changelog 0.5.5a-test

preview-model physics are disabled now (the preview wont collide with the player anymore)
updated constructions (useable bathtubs (removes dirt), useable charcoal (adds dirt), reactive targets (simple arrow-hit detection), townbook (show overall stats of your town), added arrow-maker, added references (new constructions), ...)
updated github about-page and content, merged coding-guide into project and added sub-page, added constructions sub-page
upgraded codebase, removed and refactored (a lot of) code
added overview user-interface for available construction (scroll with page up and page down)
added persistent counter for target (count how many hits youve got)
fixed bug: preview didnt worked after loading a game
fixed bug: archery target used wrong model after startup
fixed bug: archery target was active rigidbody (moved on hit), is now inactive again

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