Modular signal chain implementation

[VedantKalbag]

Find a way to implement a signal chain so that effects can be placed at different positions and turned on/off (perhaps even add a split and recombination for a wet/dry mix)

https://docs.juce.com/master/tutorial_audio_processor_graph.html

https://docs.juce.com/master/classdsp_1_1ProcessorChain.html

Child issues:
#29
#26
#27
#36
#46

[jocekav]

Current state - chain is static on launch with bypassing capabilities. Chain can be easily reordered in PluginProcessor.cpp but not yet in GUi