Sigma icons for OSX v3.0

What's a Marathon game without the sweet icons to show it off? Well,

this creation contains 37 total hi-res icons to jazz up the look of the Portal of

Sigma for OSX. Hope you enjoy them as much as I have made them!

Changes in Version 3:

- Released 9 NEW icons!!!

- Completely redid the Sigma folders.

- Included The Sigma Bonus Icons Pack, containing 21 old and

new icons.

- Cleaned up Sigma app icon once more and made it larger.

- Added a much easier way to install the icons and deleted the

unnecessary one.

- A few other minor changes.