Initial checkin of Pika from heckimp

plug-ins/lighting/TODO

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+The lighting plug-in "todo"-list:
+=================================
+
+* Supersampling/antialiasing
+* Bilinear filtering of environment map
+* Refraction back in?
+* Support for any-sized non-gray bump-maps.
+* Support for gray or alpha-channeled env-maps.
+* Zooming and scrolling in preview window
+* Autoconf/automake stuff
+* Put spotlight back in
+* Nicer interactive UI
+* Presets
+* Multiple light sources