Introduce effect LFOs/animation

[jameshball]

• Adds combobox on every effect slider to choose from the following effects:
  • Static (i.e. LFO disabled)
  • Sine
  • Square
  • Seesaw
  • Triangle
  • Sawtooth
  • Reverse Sawtooth
  • Noise
• The slider is replaced with a slider that controls LFO rate in Hz
  • The LFO slider has a green knob to distinguish it
• Add parameters for choosing the LFO and the LFO speed
• Remove 'infinite' lua sliders as dynamic parameters are not supported
  • Instead replaced with 26 lua sliders from Lua A to Lua Z
• Fix BooleanParameter not being discrete

Closes #47