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>

mods/d2k/fluent/campaign.ftl

@@ -0,0 +1,19 @@
+## world
+dropdown-difficulty =
+    .label = Difficulty
+    .description = The difficulty of the mission
+
+options-difficulty =
+    .easy = Easy
+    .normal = Normal
+    .hard = Hard
+
+## player
+bot-campaign-ai =
+    .name = Campaign Player AI
+
+## campaign-tooltips.yaml
+neutral-prefix = Neutral
+
+## harkonnen-05, ordos-04
+actor-outpost-modified-name = Modified Outpost