Ecu rework on c8

[francisfu-embedded]

ECU firmware v2

[a2k-hanlon]

Fixed an issue preventing fault lights from blinking during the fault state, adjusted the blink frequency, removed the STM32CubeIDE files from the project completely in favour of PlatformIO, moved the HLIM and LLIM logic out of the interrupt module and into their own module, and did a bit of other housekeeping.

The debouncing in the HLIM and LLIM logic also needed some correction, so please try exercising it by forcing the Elithion BMS HLIM and LLIM signals using the PC interface program for the Elithion, and make sure it still works as expected.

If everything else still works, we should merge this in to master now.

[NicolasRic]

During testing removing debouncing caused random faults... In the current state the ecu is faulting too late. We need to fix this.