Implement new color action block based on reference design

[SukuWc]

Use current 2D colorpicker insted of the proposed color cycle for now!
Use vertical alpha slider instead of the proposed intensity rotary dial for now!
'+' (Add keyframe) button should not be on the preview display, it should be in the top next to the name of the actionblock)
'-' (Remove keyframe) button is position next to it

Clicking the '+' button adds second (min) key frame. (new '+' button appears in the middle of the range)
Clicking the '+' button adds third (mid) key frame (maximum number of key frames is 3)

Each active key frame can be selected on the preview display, R, G, B and alpha values are loaded for the given key frame.

Api specification

-- Using single color parameter:
self:led_color(layer, {{r,g,b,a}})
-- Using min and max keyframes:
self:led_color(layer, {{r,g,b,a},{r,g,b,a}})
-- Using min, mid and max keyframes:
self:led_color(layer, {{r,g,b,a},{r,g,b,a},{r,g,b,a}})

Notes:
Add combobox for element selection:

• Default: 'Self' (self:element_index())
• Element 'Element 0' (element[0])
• element: 'Set manually by the user'
  Add combobox for layer selection:
• self:led_layer() 'Automatic' (Default!)
• 1 'Button/Potentiometer/Fader'
• 2 'Encoder/Endless rotation'

Questions:

• What happenes with beautify?
  • Handled in firmware
  • Beautify is added in lua microcode of the led_color method defined as member function
• Is alpha parameter 0...255 integer or 0...1 floating point?
  • 0...1 floating point represented with 2 decimal places
  • r, g, b parameters are still 0...255 integer
  • If alpha parameter is omitted then it will be considered 1 by lua microcode
• How does the actionblock determine element number?
  • Uses self to determine it in firmware during runtime by default!
• How does the actionblock determine layer number?
  • Based on self:led_layer() in runtime
  • Based on formula: layer = 1+eventtype%2