ENH: New line vector options

Paul McCarthyrequested to merge
paulmc/fsleyes:enh/linevector-modulate-line-length into main

New options for line vector overlays, including:

  • Ability to modulate the vector length by the modulate image, instead of modulating brightness/transparency.
  • Ability to modulate the vector RGB values to uniform brightness. This was being implicitly performed when the Scale vectors to unit length option was enabled, but is now an independent option.

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