Full fastled replacement

[DedeHai]

Completely removed dependency on fastled library for better color control and conversions. This also prevents accidentally pulling in fastled functions that were previously replaced (random() for example).

• Copied all required functions and structs from fastled
• Optimized most of them for WLED use, many color manipulations in FX can now be replaced with native 32bit colors, potentially speeding things up with less color conversions
• Increased accuracy for some functions by scaling the fixedpoint math making use of native 32bit variables.
• Added a PRNG class for FX that rely on repatable random numbers
• Updated FX to use the replacement functions where required

Summary by CodeRabbit

• New Features

  • Four new color palettes: Cloud, Lava, Ocean, Forest
  • Mid-frequency audio modulation added to a particle effect

• Improvements

  • More accurate and consistent color rendering across many effects
  • More predictable and reproducible randomness for visual effects
  • Streamlined palette sampling and serialization for better visual fidelity

• Refactor

  • Consolidated color/palette backend for lighter-weight, more flexible color operations