#21 Add search capability

[Richard R. Berman]

I've been using Tail For Win32 on a relatively bulky log
file (a debug log to be specific). Many times I've wished
for the ability to enter Ctrl+F (or something similar) and
then have a search dialog in order to find the entries that
I'm expected but probably have scrolled off the screen.

I'm quite open as to what form of controls (popup dialog,
Ctrl-F versus F3, toolbar entries for forward and back on
current search, etc.).

[Adam Bradley]

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A vote for that!