ADD: added updated drone.yml and changed some function calls

.drone.yml

@@ -6,6 +6,7 @@ steps:
   - name: build
     image: kmaster.ti.unibw-hamburg.de:30808/debianbullseye
     commands:
+    - git submodule update --init --recursive --jobs=4
     - mkdir -p build && cd build
     - CC=clang-11 CXX=clang++-11 cmake -DCMAKE_BUILD_TYPE=DEBUG ..
     - make -j