2.3.0: Fixed: batch/command files not found without extension

Notable changes:

• Fixed regression #2: file not found if .cmd/.bat/.com is omitted.
• C++20 is required to compile now.
• Compiled with NDEBUG in release mode (to remove the assert() calls).

2.2.3: Also shipping as 32-bit binary (UPX'ed: ~100K)

Previous releases only had the 64-bit version pre-built.
For easier handling, wtime now reports which build it is.

2.2.2: More units, better outputs, retval fix, better internals

Notable changes:

• More units: "s" (default), "seconds", "ms", "milliseconds", "m", "min", "minutes"
  (Changing it still needs recompilation, though.)
• Prints everything (incl. the results) to stderr by default.
• Prints the elapsed time also for the help text, for reference (and for fun).
• Fix: missing error return from main
• Args upgraded to 1.2.2.
• More flexible architecture: a proper timer class, command line builder; etc.

2.0.0 - Complete overhaul, after 25 years...

Notable changes:

• It finally preserves the quotes around parameters with spaces.
• Shows the result in seconds by default (instead of ms, as, unfortunately, it's a much more relatable unit for my main use case: C++ compilation...).
  (The default can only be changed by recompilation for now.)

Just preserving a pre-git .exe that's 15K UPXed! :)

It still runs happily even today! :) (Albeit it thinks its name is still wintiming...)
Alas, it didn't have the important feature of quoting args with spaces.