Direct pixelbuffer access for effects

[softhack007]

Add two segment functions

• return a pointer to the ledsrgb segment framebuffer. If no buffer exists yet, create one and fill it pixels retrieved from bus level

• write back all pixels in the framebuffer back to strip / busses level. Optimize for speed. If psram is available, optimize by only writing back changed pixels (needs a second backup buffer inpsram)

• If possible, implement for 14.7.x

• up to 20% speedup expected for ParticleFX

• add a simple demo FX (scrolling, sprites)

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