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/PowerDebugger/PowerDebugger.hpp

@@ -32,16 +32,12 @@ namespace Bloom::DebugToolDrivers
         static const std::uint16_t USB_VENDOR_ID = 1003;
         static const std::uint16_t USB_PRODUCT_ID = 8516;
 
-        PowerDebugger(): UsbDevice(PowerDebugger::USB_VENDOR_ID, PowerDebugger::USB_PRODUCT_ID) {}
+        PowerDebugger();
 
         void init() override;
 
         void close() override;
 
-        Protocols::CmsisDap::Edbg::EdbgInterface& getEdbgInterface()  {
-            return this->edbgInterface;
-        }
-
         TargetInterfaces::Microchip::Avr::Avr8::Avr8DebugInterface* getAvr8DebugInterface() override {
             return this->edbgAvr8Interface.get();
         }
@@ -52,7 +48,7 @@ namespace Bloom::DebugToolDrivers
 
         std::string getName() override {
             return "Power Debugger";
-        };
+        }
 
         /**
          * Retrieves the device serial number via the Discovery Protocol.
@@ -80,7 +76,7 @@ namespace Bloom::DebugToolDrivers
          * Any non-EDBG CMSIS-DAP commands for the Power Debugger can be sent through the EDBGInterface (as the
          * EdbgInterface extends the CmsisDapInterface).
          */
-        Protocols::CmsisDap::Edbg::EdbgInterface edbgInterface = Protocols::CmsisDap::Edbg::EdbgInterface();
+        std::unique_ptr<Protocols::CmsisDap::Edbg::EdbgInterface> edbgInterface = nullptr;
 
         /**
          * The Power Debugger employs the EDBG AVR8Generic protocol for interfacing with AVR8 targets.