Vendor helgoboss/helgobox (ReaLearn) as basis for custom UI fork

Stripped upstream git history; starting point for replacing the native
SWELL/Win32 mapping UI with something more suited to bulk editing.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

plugin-reaper-realearn/reaboot.json

@@ -0,0 +1,9 @@
+{
+  "name": "Helgobox (ReaLearn & Playtime)",
+  "sub_title": "by Helgoboss Projects",
+  "required_packages": [
+    "https://github.com/helgoboss/reaper-packages/raw/master/index.xml#p=Extensions/ReaLearn-x64&v=latest"
+  ],
+  "website": "https://www.helgoboss.org/projects/helgobox",
+  "skip_additional_packages": true
+}