Improve on bootloader security when Security Bit is set#592

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ksmith3036 wants to merge 2 commits intoarduino:masterfrom

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Commits on Jan 3, 2021

When Secure Bit is set: Prevent tries of partial flashing using Write word, Half words or Byte combinations, by flashing entire Arduino sketch.
ksmith3036
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Combine full version information into one const string in source code to optimize bootloader size, to make the bootloader for MKR VIDOR 4000 less than 8 KByte in size.
ksmith3036
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