PG4UW, OnDemand version of software for Beeprog3/BeeHive304 programmers.

List of changes (added devices, device handling improvements, fixed bugs)
against regular version of software.

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3.53a/10.2019 (18.10.2019)
- added "preserve buffer on internal programmer disk from deleting" option 
  to markedly speed-up buffer synchronization when reloading recent project