fxFoliageReplicator Update - TGEA 1.7.1

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This is a drop-in replacement for TGEA 1.7.1's fxFoliageReplicator I did for Todd Pickens's FPS Environment Pack.

I made a number of changes to the original code:

- Cleaned up classes - access, style, constified
- Added an option called 'IsSquare' based on the square foliage idea by Shawn
Simas and Jon Jorajuria from here.
[instead of making a new class, I add an option called IsSquare]
- Add error when exceeding maximum foliage count of 10922.
- Drastically decrease the number of calls to GFX->setVertexShaderConstF()
[required changes to vertex shader]
- Show warning texture for missing or invalid foliage textures
- Show the replicator immediately when you create it in the editor

Thanks to Brian Richardson for some debugging help on this!