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Cristian Maglie 8128525e83 Improve performance on serial monitor 'Show timestamp'
This patch dramatically reduce pressure on heap memory:

- use a StringTokenizer instead of the very slow String.split(...)
  method to decode newlines. This avoid allocation/deallocation of
  big strings array and use of regexp.
- pre allocate as many object as possible to avoid new allocation
  while streaming data.
- the "timestamp" string is calculated only once per iteration.
- use StringBuilder instead of inline temporary strings (that are,
  again, allocated and deallocated on each iteration)
2018-08-23 10:46:32 +02:00
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