sfndemo: various features demo
sfntest1: tests the simple renderer
sfntest2: tests the normal renderer
sfntest3: tests the font at different sizes
sfntest4: background and transparency tests
sfntest5: bounding box test
sfntest6: same as sfntest5, but rendering off-screen for valgrind testing
sfntest7: same as sfntest2, but uses the C++ wrapper class
sfntest8: generate a buffer with text and save into a Targa .tga image file