implement kb_init and kb_free to switch the console to and from graphics mode. #751
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As it is, when using the frame-buffer display on a Raspberry Pi, the console's cursor remains active. This code fixes this problem. I have tested it on a Raspberry Pi 3 under both Raspberry Pi OS and Alpine Linux, and on my x86 Linux PC. In all three cases the display works correctly and the console returns to text mode when we exit the VM.