Update Buildscript (#3)

* Delete .gitmodules

* Update buildscript

* Finish conversion to unified buildscript

* Update build.gradle

.github/scripts/test-no-error-reports.sh

@@ -0,0 +1,27 @@
+if [[ -d "run/crash-reports" ]]; then
+  echo "Crash reports detected:"
+  cat $directory/*
+  exit 1
+fi
+
+if grep --quiet "Fatal errors were detected" server.log; then
+  echo "Fatal errors detected:"
+  cat server.log
+  exit 1
+fi
+
+if grep --quiet "The state engine was in incorrect state ERRORED and forced into state SERVER_STOPPED" server.log; then
+  echo "Server force stopped:"
+  cat server.log
+  exit 1
+fi
+
+if grep --quiet 'Done .+ For help, type "help" or "?"' server.log; then
+  echo "Server didn't finish startup:"
+  cat server.log
+  exit 1
+fi
+
+echo "No crash reports detected"
+exit 0
+