Major GUI update

AD and ADSR envelope bugfix

Plugin Editor
- logo, program select at the top

Jelani Look and Feel, Resources
- fresh clean style rotary encoders
- number style sliders
- added jlcbackup folder for JUCE-module modified files
- different default colours for label, combobox, and more
- less lines in gui code for setting colour explicitly

Some images added as resources for
- copy/paste buttons
- save/load buttons
- Jelani logo

OperatorGUI
- deactivating operator disables whole row

Plugin Processor
- LFO > pitch range [-2, 2] semitones
- default init state has one sinewave active

constants
- increased envelope translation range