Add try/except blocks around external text file read operations to catch encoding-related exceptions

[mosherubin]

Added try/except blocks around read operations of external files. These are meant to catch any Unicode-related exceptions thrown while reading these files (e.g., the file contains an invalid UTF-8 sequence), providing more robust code. The except clauses will log a message pointing to the file that causes the exception. External files include:

• C++ source file being processed
• The filefilter.txt file
• Rule Python script files

These modifications were made because NsiqCppStyle often failed to read external files, due to encoding issues in the source files (e.g., invalid UTF-8 sequences, incorrect UTF16 encoding). I was often left puzzling over which file had the invalid sequence. With the try/except blocks, the user is told which file is problematic.

[kunaltyagi]

I think you've not pushed the latest changes

[mosherubin]

Got it - as part of the mixup, I needed to merge my repo's pull request-created branch into its master branch. Now you can see the changes.