Remap backlight toggle and touch button

[todd-herbert]

Addresses #3533

• Ensure E-Ink display updates after "adhoc ping" or "toggle GPS"

• Touch button wakes screen, disables screensaver (Includes TFT / OLED. Should narrow scope?)

• Re-map buttons for T-Echo

  	Send Adhoc Ping	Toggle Backlight	Exit stateDARK	Force display update
  Previous	Double Press (user button)	Double Press (user button)	--	Press (touch button)
  New	Double Press (user button)	Hold (touch button) + Double Press (user button)	Press (touch button)	Press (touch button)

  Intent is to separate "adhoc ping" and "toggle backlight" behaviors.

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I vaguely remember reading a comment that T-Echo touch has a hardware issue, where LoRa TX consistently triggers the touch button. I did not observe any cases of this during testing, but if would be good to hear from anyone who has more information.

[b8b8]

@todd-herbert Can we exclude the touch button completely please. the alternate cases i design for the t-echo are not compatible with it and ive pealed it off completely since all it did before was refresh the screen. Needing the touch button over the regular user buttons severely limits future designs. Can i ask we add 4x user button push for the t-echo light. The change you are proposing would render the light with alternate cases useless.

[todd-herbert]

@b8b8 I wasn't aware that there was any sort of customization going like that going on. I certainly don't want to break existing set-ups.

I do think there is value in making use of the touch button, but I will see if 4x user button presses is a viable alternative. It's clear that some solution has to be implemented which doesn't require use of the touch button.

I will also look into using the "Wake screen on tap or motion" user-setting to entirely disable touch button functionality.

[b8b8]

@todd-herbert great, thank you for understanding. The main issue is of course the backlight is pretty much exclusive to the t-echo and so is the touch button.

https://www.thingiverse.com/thing:5028720
here is one of my cases. i have another one that is different but has the same restriction on touch button use.

https://www.printables.com/model/302924-meshtastic-t-echo-compact-case
here is someone else's which also doesnt reuse the touch button which would have the same restriction.

[todd-herbert]

	Send Adhoc Ping	Toggle Backlight	Exit stateDARK	Force display update
Previous	Double Press (user button)	Double Press (user button)	--	Press (touch button)
Initial Suggestion	Double Press (user button)	Hold (touch button) + Double Press (user button)	Press (touch button)	Press (touch button)
Revised	Double Press (user button)	4x Press (user button)	Press* (touch button)	Press* (touch button)

* only if user sets "Wake screen on tap or motion"

Proposed behavior affects any devices which have an E-Ink backlight, and any devices with a touch button. Touch function is disabled by default, enabled with "Wake screen on tap or motion" option in display settings.