Bundled core is again inside the hardware folder.

Fixed a handful of glitches when dealing with multiple installed cores

arduino-core/src/processing/app/debug/LegacyTargetPackage.java

@@ -77,6 +77,11 @@ public class LegacyTargetPackage implements TargetPackage {
     return platforms.get(platform);
   }
 
+  @Override
+  public boolean hasPlatform(TargetPlatform platform) {
+    return platforms.containsKey(platform.getId());
+  }
+
   @Override
   public String getId() {
     return id;