Prevent VSCode CMake plugin from activating on submodules

Was auto-detecting and setting up libtcod, but this is not a CMake project

Author: HexDecimal

.vscode/settings.json

@@ -15,6 +15,7 @@
     "files.associations": {
         "*.spec": "python"
     },
+    "cmake.ignoreCMakeListsMissing": true,
     "mypy-type-checker.importStrategy": "fromEnvironment",
     "cSpell.words": [
         "aarch",