[loops] page interactions

[dndrks]

goals:

• expose as many controls as possible on the [loops] page without having to go into PARAMS (eg. clip load from loops page!)
• give non-grid users a clean way to do certain helpful performative gestures
• give grid users a clean way to do certain helpful non-performative gestures

roadmap:

• [x] make k2 (or k1?) on the main menu the only way to get to PARAMS
  • this would help free up k1 on the [loops] page for a "double-tap" to return to loop point UI (if necessary)
    • or to reset rate + window?
• [x] k3 should vertically navigate [loops]
  • this helps re-establish e1 as the loop window control without additional gestures (one-handed is primo)
• [x] k1 + e1 should horizontally navigate [loops]
  • this helps keep non-mod e1 a "change pad" function for all other pages
• [ ] add quantized encoder segments for banks
  • this helps grid + non-grid folks!!

loop points:	-	e1	e2	e3	k2	k3
no mod	window	start	end	-	-
k1 hold	change page	double/halve via start	double/halve via end	maybe loop to bpm?	toggle looping

rate + slew:	-	e1	e2	e3	k2	k3
no mod	change pad	rate	slew	-	-
k1 hold	change page	global rate	global slew	rate 1x?	random rate

buffer + offset:	-	e1	e2	e3	k2	k3
no mod	change pad	buffer	offset	-	-
k1 hold	change page	global buffer	global offset	clip select?	scale offset?