Make the cross hair less obnoxious on Mac

While on Linux it was drawn as fine 1px line, on Mac it came out rather
fat and obnoxious by default. With this it's always set to a very thin
line.

This still needs more work, but let's leave it where it is for Beta 5.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Small updates to the ReleaseNotes

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>