Flow map - #222
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Implemented flow-map support with two animation modes:
Directional Scroll: moves material textures in a selected direction.
Flow Map Water: uses a flow texture to animate only the water normal map.
The water technique uses two animation phases and blends between them to avoid visible texture resets and popping. It also supports direction fallback when no flow texture is available.
Additional improvements:
Added editor controls for selecting the technique.
Added flow-map phase handling and serialization.
Fixed normal-map strength handling.
You can see the implementation here: https://youtu.be/2EBt6AbQNbA