G1 Barrier fix #357.

[flatsponge]

Starts work to close the #357 issue with the missing barrier

righty now Gothic 1 has no magic barrier. The sky/barrier effect is missing, and you can also just walk out of the world.

I fixed it and also changed it so the barrier is more noticeable since with the new lightning it was barely visible when I just implemented it regularly.

This draft starts bringing it back by:

• added a first custom Gothic 1 magic barrier shader path inside the material shader
• making the barrier use an animated/distorted effect instead of a normal transparent material

Still needs work:

• tune the look
• more work on the actual boundary damage / world limit behavior
• performance improvements
• maybe add a setting to toggle the strenth of the barrier effect?

Preview:

Untitled.design-16.mp4