Initial commit: OpenRA game engine

Fork from OpenRA/OpenRA with one-click launch script (start-ra.cmd)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packaging/linux/openra-mimeinfo.xml.in

@@ -0,0 +1,9 @@
+<?xml version="1.0"?>
+<mime-info xmlns='http://www.freedesktop.org/standards/shared-mime-info'>
+  <mime-type type="x-scheme-handler/openra-{MODID}-{TAG}">
+    <icon name="openra-{MODID}" />
+    <generic-icon name="applications-games"/>
+    <comment>Join OpenRA server</comment>
+    <glob weight="60" pattern="openra-{MODID}-{TAG}://*"/>
+  </mime-type>
+</mime-info>