english groove.exe (2000-10-17) supported next to the german one: named exe sites found by signatures per build (german patches byte-identical), base patch and every exe mod on both, unknown builds get a clear message; display diagnostics moved to troubleshooting with a warning (it flashes every monitor black)

build.gradle

@@ -99,6 +99,8 @@ test {
     systemProperty 'llamamod.ref', System.getProperty('llamamod.ref', '')
     // level builder references: python3 tools/levelbuild.py levels/testwelt.py <lbref>/testwelt.wad etc.
     systemProperty 'llamamod.lbref', System.getProperty('llamamod.lbref', '')
+    // English groove.exe (2000-10-17) for the version tests; never committed, skipped when absent
+    systemProperty 'llamamod.exeEn', System.getProperty('llamamod.exeEn', "${projectDir}/re/groove_en.exe")
     maxHeapSize = '2g'
 }