Tidying low-level debug tool driver code:

- Use automatic objects for libusb/hidapi resources, where possible (to reduce manual resource management)
- Removed unused/redundant code
- Tidied HidInterface class
- Tidied debug tool initialisation code
- Other bits of tidying

src/DebugToolDrivers/Microchip/XplainedPro/XplainedPro.hpp

@@ -34,16 +34,12 @@ namespace Bloom::DebugToolDrivers
         static const std::uint16_t USB_VENDOR_ID = 1003;
         static const std::uint16_t USB_PRODUCT_ID = 8465;
 
-        XplainedPro(): UsbDevice(XplainedPro::USB_VENDOR_ID, XplainedPro::USB_PRODUCT_ID) {}
+        XplainedPro();
 
         void init() override;
 
         void close() override;
 
-        Protocols::CmsisDap::Edbg::EdbgInterface& getEdbgInterface()  {
-            return this->edbgInterface;
-        }
-
         DebugToolDrivers::TargetInterfaces::TargetPowerManagementInterface* getTargetPowerManagementInterface() override {
             return this->targetPowerManagementInterface.get();
         }
@@ -54,7 +50,7 @@ namespace Bloom::DebugToolDrivers
 
         std::string getName() override {
             return "Xplained Pro";
-        };
+        }
 
         /**
          * Retrieves the device serial number via the Discovery Protocol.
@@ -74,7 +70,7 @@ namespace Bloom::DebugToolDrivers
         void endSession();
 
     private:
-        Protocols::CmsisDap::Edbg::EdbgInterface edbgInterface = Protocols::CmsisDap::Edbg::EdbgInterface();
+        std::unique_ptr<Protocols::CmsisDap::Edbg::EdbgInterface> edbgInterface = nullptr;
         std::unique_ptr<Protocols::CmsisDap::Edbg::Avr::EdbgAvr8Interface> edbgAvr8Interface = nullptr;
 
         std::unique_ptr<