Exclude additional paths in editorconfig-checker configuration

The editorconfig-checker tool is used to check for compliance with the basic formatting style in the project files.

This check should only be done on the files that are directly developed as part of the project. Any generated or
externally maintained files should not be checked, since we don't have control over the formatting of those files.

Previously the tool was checking the generated files in the `.git` folder. This resulted in a spurious failure of the
check. The `.ecrc` configuration file is hereby synced with the standardized upstream "template", introducing an
exclusion of the `.git` folder as well as other common locations of generated and externally maintained files.

Author: per1234

.ecrc

@@ -1,5 +1,9 @@
 {
   "Exclude": [
+    "^\\.git[/\\\\]",
+    "^\\.licenses[/\\\\]",
+    "__pycache__[/\\\\]",
+    "node_modules[/\\\\]",
     "^LICENSE\\.txt$",
     "^poetry\\.lock$",
     "^RFCs/0002-pluggable-discovery.md",