Added clear filter button

[droberts-ctrlo]

As session filter doesn't clear, a clear filter button had to be added. The icon is the best I feel I could do as there isn't one I feel is suitable within our icon set.

[abeverley]

Thanks Dave, this is great, and the use of the icon is quite ingenious! I think you could just simplify the condition in the controller a bit like this:

if (param 'audit_filtering')
{
    ...
}
elsif (defined param('clear'))
{
    session 'audit_filtering' => undef;
}