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/MplabSnap/MplabSnap.hpp

@@ -39,16 +39,12 @@ namespace Bloom::DebugToolDrivers
         static const std::uint16_t USB_VENDOR_ID = 1003;
         static const std::uint16_t USB_PRODUCT_ID = 8576;
 
-        MplabSnap(): UsbDevice(MplabSnap::USB_VENDOR_ID, MplabSnap::USB_PRODUCT_ID) {}
+        MplabSnap();
 
         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();
         }
@@ -59,7 +55,7 @@ namespace Bloom::DebugToolDrivers
 
         std::string getName() override {
             return "MPLAB Snap";
-        };
+        }
 
         /**
          * Retrieves the device serial number via the Discovery Protocol.
@@ -79,7 +75,7 @@ namespace Bloom::DebugToolDrivers
         void endSession();
 
     private:
-        Protocols::CmsisDap::Edbg::EdbgInterface edbgInterface = Protocols::CmsisDap::Edbg::EdbgInterface();
+        std::unique_ptr<Protocols::CmsisDap::Edbg::EdbgInterface> edbgInterface = nullptr;
 
         /**
          * The MPLAB Snap employs the EDBG AVR8 Generic protocol, for debugging AVR8 targets. This protocol is