Extend squid for checks
Common files for checks
Check for TODO and FIXME comments
Check for NOSONAR comment
Check for compliant file headers
Check for tab characters in source files
Checks new line character before EOF
Checks length of a source code line
Checks the LOC of a file
Check for one statement per line
Check to detect commented code
Check for magic numbers
Check for duplicated string literals
Generic pattern check for comments
Missing test files for LF before EOF check
Incoorporate comments
Incorporate comments
Improve SQUID for new checks

- split selectionStatement and refine switch statement
- introduce nullptr rule
update common check list files

7 additional checks
check collapsible if candidate