Add some test data.

Signed-off-by: Jim Teeuwen <jimteeuwen@gmail.com>
Extend the Log class with a filter facility.
The for_each() call can apply a regular expression filter
to all log entries and return only those which match.

This is a preparation for the UI component of the log. With many active
processors, it may display a sizeable list of entries. The filter will
allow the user to focus on specific files or types of messages.

Signed-off-by: Jim Teeuwen <jimteeuwen@gmail.com>
Adds testdata to the .gitignore file.
There is no need for this data in the repo.

Signed-off-by: Jim Teeuwen <jimteeuwen@gmail.com>
Removes testdata from the repo.

Signed-off-by: Jim Teeuwen <jimteeuwen@gmail.com>