vmon: implement --strobe-fileHEADmaster

This is an in-place non-atomic snapshot variant saved on SIGUSR2.

The intended purpose of this is in embedded scenarios where you
want to minimize space consumption, but need a way for triggering
saving a snapshot at a specific time, without any potential for
accumulating more than one, and don't care about the potential
for a consumer of this file racing with the writer - you just
want to limit the space used above all else.

While here bump some copyright years as it's now 2026.

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