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In the process of creating/testing the new Synchronet Virtual DOS Modem (SVDM) project, I made the following significant improvements:

- Don't default the log level to DEBUG for debug builds
- Add a "carrier change" event so carrier low to high transitions can be tracked too
- Replace several lprintf() calls with lputs() for performance reasons
- Specify 'volatile' storage for pending_interrupts
- Interrupts are re-asserted if there are any pending interrupts after reading IIR register
- Emulate FIFO enablement
- Support RTS flow control signal
- Remove conditional/configurable yields when polling LSR and MSR register, would just unnecessarily slow down terminal programs
- Report "DCD change" in MSR correctly
- Clean-up (e.g. close handles) in VDD_CLOSE handler
- VDD_LOAD_INI_FILE allows an optional ini filename (instead of directory) as its argument - for loading an ini filename other than sbbsexec.ini (e.g. svdm.ini).

Initialize log level in VDDInitialize(). For versions of Windows/NTVDM that use/call the "init proc" (this function), we just re-initialize global variables here.

Most of the copyright years in the source code were misleading (the date of
most recent publish was actually later) and all were unnecessary. I've been
removing copyright years piecemeal, for a long time, but I decided it was time
to just perform a bulk search and (mostly) replace. In some cases, I left
old copyright years on files that either are not used (and soon to be removed)
or obsolete and unlikely to ever be touched again (e.g. Win9x FOSSIL VXD). Some
of the runtime binaries still contain copyright years and those were updated to
2018.