Startup behaviour fixes (#1306)

* Reduce PPS max to 20V to avoid instability

Some PSU's cant actually run at 21V

* Creating a rough draft of a "pre start check" concept

* Newer alpine

* Cleaning up MHP detection

* Cleanup comments

* PID: Run prestart based on ADC IRQ rather than times

* MHP30: Far better startup for detecting tip gain

* Newer alpine for github CI

source/Core/BSP/Miniware/BSP.cpp

@@ -282,4 +282,5 @@ bool isTipDisconnected() {
   return tipTemp > tipDisconnectedThres;
 }
 
-void setStatusLED(const enum StatusLED state) {}
+void    setStatusLED(const enum StatusLED state) {}
+uint8_t preStartChecks() { return 0; }