Add FreeBSD WLAN drivers to x86_64 images.

Tested working with iprowifi4965, the rest at least compiles.
freebsd_network: Check non-packaged data dir for firmware.

When loading firmware, check the system non-packaged data dir first,
then the system data directory (as before). This allows loading of
firmware that doesn't reside in the system package.
Appearance: Increase max font size to 24 and add 16 to the list.

The list went up to 24 already, but was capped by the previous max size
of 18. Adding 16 to the arbitrary list of font sizes closes the rather
large gap between font sizes 14 and 18 that were already in the list.
Providing a slider or text field for the font size would probably be
better in the long run.
Typo: Fix doubled "not" in comment.