Double Battery Automatic Contactor Support GPIO

[malcolmputer]

Expected Behavior

It would be great for double battery support to also support automatic contactor support utilizing GPIO, something like this:

// Contactor handling
#define POSITIVE_CONTACTOR_PIN 32
#define NEGATIVE_CONTACTOR_PIN 33
#define PRECHARGE_PIN 25

#define 2ND_POSITIVE_CONTACTOR_PIN 13
#define 2ND_NEGATIVE_CONTACTOR_PIN 16
#define 2ND_PRECHARGE_PIN 18

Actual Behavior

Currently this has to be done manually, or utilizing a battery that supports contactor control over CAN, since the 3lb board that's in development supports multiple relays, it makes sense to support this.

[dalathegreat]

PR for this is UP 🙌 #619

[dalathegreat]

Closed as completed! Target for 7.8.0 release!