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/about.toml

@@ -0,0 +1,24 @@
+accepted = [
+    "MIT",
+    "Apache-2.0",
+    "BSD-2-Clause",
+    "BSD-3-Clause",
+    "ISC",
+    "BSL-1.0",
+    "CC0-1.0",
+    "OFL-1.1",
+    "Zlib",
+    "MPL-2.0",
+    "Unicode-DFS-2016",
+    "LicenseRef-UFL-1.0",
+    "OpenSSL",
+]
+
+workarounds = [
+    "ring",
+]
+
+private = { ignore = true }
+
+ignore-dev-dependencies = true
+ignore-build-dependencies = true