CS-80R updated to v1.3

Rick Jelliffe has updated CS-80R to version 1.3 which includes improvements to allow both brasher CS-50/CS-60 type sounds and warmer CS-80 type sounds.

Changes:

• Better CS-60/CS-50/GX-1 emulation: "Blat" switch with "Presence" switch simulates channel peak distortion at two points in the signal chain.
• Better CS-80 emulation: stereo chorus and warmer filtering.
• Re-worked ring modulator.
• "Unshape Lo" switch reduces sawtooth waveshaping for low notes, for better emulation of CS-*.
• "Unshape Hi" switch reduces sawtooth reshaping for high notes, for improved anti-aliasing.
• Other clipping and anti-aliasing improvements.
• GUI improved.