CF.lumen updated to v3.70

This minor update primarily fixes 'performance mode' of the 'CF.lumen driver' on various Nougat devices. The grayscale filter is now scale from grayscale to normal saturation, instead of a plain toggle.

Changelog
- (c) 2017
- Upgrade grayscale filter from a toggle to a saturation slider
- CF.lumen driver: fix 'performance mode' on Nougat (bypass new linker protections)
- CF.lumen driver: fix darken filter math issue (still doesn't work on invert, though)
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