Add icon to window

[PushingCoder572]

It makes it look 100x cooler.

[PushingCoder572]

GLFWimage icons[1];
icons[0].pixels = SOIL_load_image("icon.png", &icons[0].width, &icons[0].height, 0, SOIL_LOAD_RGBA);
glfwSetWindowIcon(window.window, 1, icons);
SOIL_free_image_data(icons[0].pixels);