Increment the version in the project file to v3.19a.

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.

program to detect a currently running instance of sbbsctrl.exe.

The attempt list can be view with sbbscon->'a' command or sbbsctrl->view->Login
Attempt List...
Delay/throttle/hacklog/and auto-filter values/thresholds are now configurable
in sbbs.ini.