Mini-Patch: a few tweaks

I made a few small tweaks to the game based on data collected from the prior update.

• Changed the Kills Per Second achievement "Total Carnage!" to have a requirement of 30 Kps to reflect recent changes in difficulty.

• Added support for 1280 x 1024 Monitor resolution as requested in the discussion forum. If you have a resolution you would like to see supported, feel free to just ask by making a post about it in the community discussion.

• Slightly tweaked some values on weapons to make the steps of each tier more balanced and appropriate.

• Fixed a graphical bug.

• Lowered the range on basic zombie attacks by about 30%.

-Loren Lemcke