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Render to texture

Here is some starter code:

• texture.frag This has some example effects.
• In RenderEngine.h, display(), near //activate our new framebuffer, change glBindFramebuffer(GL_FRAMEBUFFER, 0); to glBindFramebuffer(GL_FRAMEBUFFER, frameBuffer);
• In RenderEngine.h, display(), near //default framebuffer uncomment the call to glClearColor and glClear.
• In RenderEngine.h, display(), uncomment the call to glDrawArrays(GL_TRIANGLES, 0, 6);.