Tidying RISC-V register structs

- Removed unnecessary bit fields
- Added default values to members
- Removed all user-defined constructors to make the structs aggregate, replacing the from-value constructor with a `fromValue()` status member function.
- Made use of designated initialisation
- Changed unscoped enums to scoped
- Other small bits of tidying

src/DebugToolDrivers/Protocols/RiscVDebugSpec/DebugTranslatorConfig.cpp

@@ -1,11 +1,13 @@
 #include "DebugTranslatorConfig.hpp"
 
+#include <cstdint>
+
 namespace DebugToolDrivers::Protocols::RiscVDebugSpec
 {
     DebugTranslatorConfig::DebugTranslatorConfig(const YAML::Node& configNode) {
         if (configNode["targetResponseTimeout"]) {
             this->targetResponseTimeout = std::chrono::microseconds{
-                configNode["targetResponseTimeout"].as<int>(this->targetResponseTimeout.count())
+                configNode["targetResponseTimeout"].as<std::int64_t>(this->targetResponseTimeout.count())
             };
         }
     }