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

src/Targets/TargetVariantDescriptor.hpp

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <string>
+
+namespace Targets
+{
+    struct TargetVariantDescriptor
+    {
+    public:
+        std::string name;
+        std::string pinoutKey;
+
+        TargetVariantDescriptor(
+            const std::string& name,
+            const std::string& pinoutKey
+        );
+
+        TargetVariantDescriptor(const TargetVariantDescriptor& other) = delete;
+        TargetVariantDescriptor& operator = (const TargetVariantDescriptor& other) = delete;
+
+        TargetVariantDescriptor(TargetVariantDescriptor&& other) noexcept = default;
+        TargetVariantDescriptor& operator = (TargetVariantDescriptor&& other) noexcept = default;
+    };
+}