Check processing load on the ES Daisy board

[TheSlowGrowth]

To understand how many channels we can do on the device, let's attempt to run the DSP code on the ES Daisy Seed and see how much channels we can handle concurrently.

[TheSlowGrowth]

Test results

from branch feature/TSG/hardware-performance-tests

• 4 stereo loopers
• 44.1kHz (requires this PR in libDaisy to be merged)
• high shelf emphasis EQ removed to save cycles
• pre-gain removed to save cycles (it was unused anyway)
• mapping of UI controls is still missing

When all 4 loopers play back at 4x speed, we hit 90% processor utilisation. I think this could actually work :-)