Renamed part description files to target description files.

Introduced a generic target description file class with an AVR8 derivation.
Moved AVR8 target description files

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

@@ -0,0 +1,72 @@
+#pragma once
+
+#include "src/Targets/TargetDescription/TargetDescriptionFile.hpp"
+
+#include "src/Targets/Microchip/AVR/TargetSignature.hpp"
+#include "src/Targets/Microchip/AVR/AVR8/Family.hpp"
+
+namespace Bloom::Targets::Microchip::Avr::Avr8Bit::TargetDescription
+{
+    /**
+     * Represents an AVR8 TDF. See the Targets::TargetDescription::TargetDescriptionFile close for more on TDFs.
+     *
+     * During the build process, we generate a JSON file containing a mapping of AVR8 target signatures to target
+     * description file paths. Bloom uses this mapping to find a particular target description file, for AVR8 targets,
+     * given a target signature. See directory "build/resources/TargetPartDescriptions".
+     * The generation of the JSON mapping, is done by a PHP script:
+     * "build/scripts/CopyAvrPartFilesAndCreateMapping.php". This script is invoked via a custom command, at build time.
+     */
+    class TargetDescriptionFile: public Targets::TargetDescription::TargetDescriptionFile
+    {
+    private:
+        /**`
+         * AVR8 target description files include the target family name. This method returns a mapping of part
+         * description family name strings to Family enum values.
+         *
+         * TODO: the difference in AVR8 family variations, like "tinyAVR" and "tinyAVR 2" may require attention.
+         *
+         * @return
+         */
+        static inline auto getFamilyNameToEnumMapping() {
+            // All keys should be lower case.
+            return std::map<std::string, Family> {
+                {"megaavr", Family::MEGA},
+                {"avr mega", Family::MEGA},
+                {"avr xmega", Family::XMEGA},
+                {"avr tiny", Family::TINY},
+                {"tinyavr", Family::TINY},
+                {"tinyavr 2", Family::TINY},
+            };
+        };
+
+    public:
+        /**
+         * Will resolve the target description file using the target description JSON mapping and a given target signature.
+         *
+         * @param targetSignatureHex
+         * @param targetName
+         */
+        TargetDescriptionFile(const std::string& targetSignatureHex, std::optional<std::string> targetName);
+
+        /**
+         * Loads the AVR8 target description JSON mapping file.
+         *
+         * @return
+         */
+        static QJsonObject getTargetDescriptionMapping();
+
+        /**
+         * Extracts the AVR8 target signature from the target description XML.
+         *
+         * @return
+         */
+        TargetSignature getTargetSignature() const;
+
+        /**
+         * Extracts the AVR8 target family from the target description XML.
+         *
+         * @return
+         */
+        Family getFamily() const;
+    };
+}