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>

glsl/postprocess_chronoshift.frag

@@ -0,0 +1,15 @@
+#version {VERSION}
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+uniform float Blend;
+uniform sampler2D SourceTexture;
+out vec4 fragColor;
+
+void main()
+{
+	vec4 c = texelFetch(SourceTexture, ivec2(gl_FragCoord.xy), 0);
+	float lum = 0.5 * (min(c.r, min(c.g, c.b)) + max(c.r, max(c.g, c.b)));
+	fragColor = mix(c, vec4(lum, lum, lum, c.a), Blend);
+}