Fix tool handles not clicking on mac/retina screens #57
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This fixes an issue where mac computers with retina screens cannot use tool handles to manipulate game objects, the clicks are not detected. This appears to be related to HDPI and the framebuffer used to detect clicks on the tool handles. Implemented a fix using temporary Pixels HDPI mode when rendering to tool handle FBO as described in wiki: https://libgdx.com/wiki/graphics/opengl-utils/frame-buffer-objects