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/build-linux-complete.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+# Exit immediately if a command exits with a non-zero status
+set -e
+
+PROFILE="$1"
+
+set -a
+source ".$PROFILE.env"
+set +a
+
+# Build commands
+cargo build --features "playtime,licensing"