- Refactored AVR8 constructor, moving TDF construction to the TargetControllerComponent

- The `TargetControllerComponent` now resolves the target via the new generated mapping approach
- Added `TargetDescriptionFile` derived class
- Removed obsolete JSON map processing code
- Other bits of refactoring and tidying

src/Targets/Microchip/AVR/AVR8/TargetDescription/TargetDescriptionFile.hpp

@@ -33,27 +33,13 @@ namespace Targets::Microchip::Avr::Avr8Bit::TargetDescription
     class TargetDescriptionFile: public Targets::TargetDescription::TargetDescriptionFile
     {
     public:
-        /**
-         * Will resolve the target description file using the target description JSON mapping and a given target name.
-         *
-         * @param targetName
-         */
-        TargetDescriptionFile(const std::string& targetName);
-
         /**
          * Extends TDF initialisation to include the loading of physical interfaces for debugging AVR8 targets, among
          * other things.
          *
          * @param xml
          */
-        void init(const QDomDocument& document) override;
-
-        /**
-         * Loads the AVR8 target description JSON mapping file.
-         *
-         * @return
-         */
-        static QJsonObject getTargetDescriptionMapping();
+        explicit TargetDescriptionFile(const std::string& xmlFilePath);
 
         /**
          * Extracts the AVR8 target signature from the TDF.