SigmaDSP v1.1.1

Changelog:

• Improve dynamic bass algorithm
  • It's now possible to adjust the boost frequency, threshold, and time constant.
  • See 7_Dynamic_bass_boost example for details
• Support for non-slew, generic gain controls in various filters (#19)
• Support DC control of index filters (#19)
• Fix gain calculation for EQ 2nd order low pass filters (#20)
• Fix typo in 0_Template example (#27)
• Add 8_Compressor_RMS example