Prepare XMRig-HAC fork for public release

- Add DragonX coin and rx/hush algorithm support
- Update branding to XMRig-HAC / dragonx.is
- Update repository URLs to git.hush.is
- Replace example wallet addresses with placeholders
- Update .gitignore for build directories
- Document fork changes in README and CHANGELOG

package.json

@@ -11,13 +11,13 @@
   },
   "repository": {
     "type": "git",
-    "url": "git+https://github.com/xmrig/xmrig.git"
+    "url": "git+https://git.hush.is/dragonx/xmrig-hac.git"
   },
   "keywords": [],
   "author": "",
   "license": "GPLv3",
   "bugs": {
-    "url": "https://github.com/xmrig/xmrig/issues"
+    "url": "https://git.hush.is/dragonx/xmrig-hac/issues"
   },
-  "homepage": "https://github.com/xmrig/xmrig#readme"
+  "homepage": "https://git.hush.is/dragonx/xmrig-hac#readme"
 }