Crash fix for Mac users

We have made a slight change in the way Crying Suns is launching on Steam on Mac. When you click on the "Play" button in the Steam launcher, you will now be presented with two options:

• 1️⃣ "Play Crying Suns", which launches the game as usual,
• 2️⃣ "Play Crying Suns (Intel iGPU - OpenGL)", which launches the game using the Unity's OpenGL graphics API.

This second option should fix the freezes some players have experienced with Intel integrated GPUs (iGPUs).
The game should run as usual, but without a very specific visual effect (a rim on characters) which is not available through OpenGL due to the lack of support for Compute Shaders.

Don't hesitate to give your feedback if the game still encounters troubles after these changes on Mac.