Settings loader update with basic email check, and on check abort if not valid

In the settings checker, if a regex_clean is set as None then we will abort the script with error
if the regex is not matching

Add regex check for email basic

Also add a regex_constants list with regex entries (not compiled and compiled)

pyproject.toml

@@ -54,7 +54,8 @@ notes-rgx = '(FIXME|TODO)(\((TTD-|#)\[0-9]+\))'
 [tool.flake8]
 max-line-length = 120
 ignore = [
-    "E741" # ignore ambigious variable name
+    "E741", # ignore ambigious variable name
+    "W504"  # Line break occurred after a binary operator [wrong triggered by "or" in if]
 ]
 [tool.pylint.MASTER]
 # this is for the tests/etc folders