Improve disk tracing

    - Disk trace is now ASCII output
    - Output track sector and file position data
    - Debugger command added
    - New preprocessor define
CPU_TRACING bugfix and more readable

    - GetImm mode was not reporting correct arg
    - Converts it to a format easier to compare against similar CPU trace output from AppleWin
    - Sanity-check arg counts
CPU fixes from tracing against AppleWin

    - All regs are 0xFF on reboot
    - Stack pointer is 0xFC on reboot
    - Flags are set accordingly
    - Fix op_JMP_ind tracing display
Annunciator is noop for the moment
Expose c_read_random()
Don't reset joystick buttons on menu exit
new SHA1 to fix cputrace test