Massive refactor to accommodate RISC-V targets

- Refactored entire codebase (excluding the Insight component) to accommodate multiple target architectures (no longer specific to AVR)
- Deleted 'generate SVD' GDB monitor command - I will eventually move this functionality to the Bloom website
- Added unit size property to address spaces
- Many other changes which I couldn't be bothered to describe here

build/scripts/Targets/TargetDescriptionFiles/Services/AtdfService.php

@@ -323,6 +323,7 @@ class AtdfService
             isset($attributes['id']) ? strtolower($attributes['id']) : null,
             $this->stringService->tryStringToInt($attributes['start'] ?? null),
             $this->stringService->tryStringToInt($attributes['size'] ?? null),
+            null,
             $attributes['endianness'] ?? null,
         );