Get rid of vista_sec.txt

[awiddersheim]

At the surface, the vista_sec.txt seems to be unnecessary.

It's purpose has been documented in #204 (comment).

Should test removing it and see what breaks if anything.

The NXLog project is a good source for Eventlog code. Should use them for inspiration.

[jrossi]

Is this a 2.9 change or after?

[awiddersheim]

Probably will take a good bit of time to make the change and thoroughly test so I put the 3.0 milestone on this. Short answer, after.