Pmem reset

[u-foka]

Ignore pmem contents during startup if the select key is being held down.
This could solve boot hangups that typically happen after flashing.
Checked and compatible with hardware selection keys.
If one wants to both select (or keep selecting) a hw version, while ignoring pmem both the right direction and select keys has to be held down.

[jLynx]

Just the stuff we talked about in discord

[u-foka]

Its ready.

Now left+right key held down together ignores the pmem at boot. I was thinking and choose a combination that cannot be accidentally triggered.

Also the hardware selection keys are only active during boot when theres only one key pressed, so it wont interfere with any double key trigger in the future.

[Brumi-2021]

I checked the Test -drive binary , that has combined Debut and this Reset pmem.
I could confirm , that the freq, volume , AMP , VGA, and other user settings (splash , LCD timer , add return GUI key , becomes
reset to default values when keeping pressing LEFT - RIGTH when booting .
I checked , when using pmem , and it works well -
(But when Pmem Mgnt is set up to SD card, I can not see that reset , ex. freq , VGA, AMP, ...
maybe intentionally . )
Anyway considering pmem, (not SD card, that has his separate reset option) , To me it is checked and approved .

[jLynx]

Nice work getting this all fixed,

[Brumi-2021]

Guauuuuu @u-foka , thanks a lot !!!!
That PR , fixed completelly my local problem ,

From fw version 1.5.4 onwards , it was introduced that PR #662 that uses the persistent memory to test and store the hardware and LCD config settings, from that point , when reflashing binaries compiled

from (gcc-arm ... version 9.3) --> to my local (gcc -arm.version 10.3) ,
In my case,changing any binary created from 9-3 ---> 10.3 , I always got incorrect boot, just flashing the top LED's ...
And to solve it , I always need to reflash to a very old one fw ,ex. 1.4.3 ( (prior to the sharebrained commit about persistence memory ) and from that fw version , I can reflash without any problem to any fw created with my local compilation gcc-10.3

But thanks to that PR, I will no need to use the intermediate 1.4.3, anymore !
I tested now , I got again wrong BOOT , with top LED , flashing , but switching off and switching on pressing LEFT / RIGHT , voilà , solved completely , and having a correct boot.

Thanks a lot @u-foka , this PR , gave me tools to reset the persistent memory and solve that nasty problem
👏👏👏👌.