Refactored Insight GUI to accommodate the many changes made to Bloom's internals

Also lots of tidying.

src/ProjectConfig.hpp

@@ -52,13 +52,6 @@ struct TargetConfig
      */
     Targets::TargetPhysicalInterface physicalInterface;
 
-    /**
-     * The name of the selected target variant.
-     *
-     * Insight uses this to determine which variant to select on start up.
-     */
-    std::optional<std::string> variantName;
-
     /**
      * Determines whether Bloom will make use of the target's hardware breakpoint resources (if available).
      */
@@ -157,6 +150,11 @@ struct InsightConfig
      */
     bool shutdownOnClose = false;
 
+    /**
+     * The key of the variant to select by default, in the Insight GUi.
+     */
+    std::optional<std::string> defaultVariantKey;
+
     InsightConfig() = default;
 
     /**