Function:    StartTimer()

               This function starts an internal Timer that, once
               started, can be inspected any time with GetTimer()
               or its ASCII equivalent TimerStr(). StartTimer()
               just holds the current time (in seconds from
               midnight), and GetTimer deduces the elapsed time
               by substracting with the current Time. All three
               Timer functions were written fully in assembly and
               thus only use a very small portion of code,
               including the variables and string part (about 150
               bytes).

  Syntax:      StartTimer();

  Arguments:   None.

  Returns:     Nothing.

  Usage:       StartTimer(()
               Do ThisAndThat
               ? 'Seconds elapsed '+GetTimer()
               ? 'Time elapsed    '+TimerStr()