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/.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Use this if something doesn't work
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. macOS]
+ - Version [e.g. Ventura 13.6.7]
+
+**Additional context**
+Add any other context about the problem here.

plugin-reaper-realearn/.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Question
+    url: https://github.com/helgoboss/helgobox/discussions/categories/q-a
+    about: "GitHub Discussions: Ask or answer a question"
+  - name: Idea
+    url: https://github.com/helgoboss/helgobox/discussions/categories/ideas?discussions_q=category%3AIdeas+is%3Aopen+sort%3Adate_created+
+    about: "GitHub Discussions: Request a new feature or suggest an improvement (please watch out for existing issues first and vote for them)"
+  - name: General feedback
+    url: https://github.com/helgoboss/helgobox/discussions/categories/general
+    about: "GitHub Discussions: Give general feedback"