Support different Encodings

[ghaith]

Is your feature request related to a problem? Please describe.
We currently only parse UTF-8 files. We should allow different encoding using a flag.

Describe the solution you'd like
A --encoding parameter sets the encoding the files are using.
We could use encoding_rs to read the file.

Describe alternatives you've considered
We could try to use encoding detection and automatically detect what each file was, but I feel this might be overkill.

Additional context
Many Windows-based files would be using the standard Windows encoding in EU it is CP-1252
This ensures we can parse these files without converting them to UTF-8