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/TargetDescription/PropertyGroup.hpp

@@ -0,0 +1,25 @@
+#pragma once
+
+#include <string>
+#include <QString>
+#include <map>
+
+namespace Bloom::Targets::TargetDescription
+{
+    struct Property
+    {
+        std::string name;
+
+        /*
+         * We use QString here as we're dealing with arbitrary values and QString provides many helpful
+         * functions to make this easier.
+         */
+        QString value;
+    };
+
+    struct PropertyGroup
+    {
+        std::string name;
+        std::map<std::string, Property> propertiesMappedByName;
+    };
+}