Patch to add "apply filter" toolbar button.

[ajs]

Patch to add "apply filter" toolbar button.

The "apply filter" toolbar button allows to apply/remove the filter with the mouse. It works as clicked/unclicked button, so it also shows quickly if the filter is applied or not.

Patch against commit 186. "Shell Images Large.bmp" needs to be copied manually to the "res" folder.

[ajs]

Improvement to this patch.

Now clicking on the "apply filter" toolbar button works as follow:
- if the folder is already filtered, the filter is removed.
- if the folder is not filtered and CTRL not pressed, the button open the "set filter" dialog, so it is possible to enter a filter pattern
- if the folder is not filtered and CTRL is pressed, the button reapplies the last filter directly.

Patch upgraded to commit 188

[ajs]

Since I need this patch as base for another patch, I have updated it to commit 204.
Same functionality and same code, just a couple of minor adjustment to the code which handles the status of the toolbar button.