Rework anti-tiling

[outobugi]

This implements a new anti-tiling method. The UV is moved around a point (UV+0.5). The result is jittered/dithered and less chaotic than the old broken rotation. Obviously no anti-tiling is made for every texture.

I removed 'noise3' and used the textures alpha to blend the domain transitions. This is because the noise blending looked messy when blending two or more of the same texture together.

I also removed normal map rotation as it is redundant because nothing is rotated anymore.

Closes(?) #145
Fixes #201

[TokisanGames]

This is an improvement over the old uv_rotation. And it may help some users with a cheap, psuedo detiling on some textures, so it can close #201.

However, it's not an adequate detiling option so #145 can stay open and be renamed.

v0.8.2 vs this PR

checkerboard.mp4

I removed 'noise3' and used the textures alpha to blend the domain transitions. This is because the noise blending looked messy when blending two or more of the same texture together.

I'm conflicted about this. noise3 is used to add noise to the blending edge of textures. I see that it does strengthen the normals in the textures that are rotated, away from the edges of texture blends.

However removing the noise makes the blending pattern between textures much blocker and far more difficult to paint with a natural blend.

Blending between textures is far more important to me than the rotation feature.

This does consider the texture height on the blend more so than before, so some textures like rock through grass do blend better. But other textures very easily turn into squares and are much more difficult to blend without these squares.

Without noise3

With noise3

Perhaps we can keep noise3 and average it into the height with a user settable factor (per texture maybe, or at least for all).

[TokisanGames]

Here is the blend with this PR and no noise3

With noise3

Here is both averaged, which is an improvement.

Here is both added. So far, I think this is the best option. Painting is good and the height of rocks is improved over the main branch. And the rotated textures still has most of its height.

[TokisanGames]

This is an improvement, so I will add noise3 to the height (unless you want to) and merge in this PR today or tomorrow.

[TokisanGames]

Thanks!