scripts: new linter script to detect goal_src files with trailing whitespace (#3387)

Removes trailing whitespace from goal_src files, eventually the
formatter will do this as well but it's not ready yet so this is a
decent interim solution.

A competent text editor will also do this / flag it for you.

Taskfile.yml

@@ -84,6 +84,7 @@ tasks:
     desc: "Format code"
     cmds:
       - cmd: python ./scripts/cpp/format-includes.py
+      - cmd: python ./scripts/ci/lint-trailing-whitespace.py --fix
       - cmd: python ./third-party/run-clang-format/run-clang-format.py -r common decompiler game goalc test tools lsp -i
       - task: format-json
   # DECOMPILING
@@ -153,6 +154,9 @@ tasks:
     desc: Finds and tries to fix invalid translation Characters
     cmds:
       - python ./scripts/ci/lint-characters.py --fix
+  lint:
+    cmds:
+      - python ./scripts/ci/lint-trailing-whitespace.py
   # TESTS
   offline-tests: # ran by jenkins
     cmds: