[Feature] Allow usage of other options when --config/-c option is used with those other options missing

[lmpham1]

Problem

Currently, the program does not support using --config/-c option with other options, and uses default setting if other options are not specified in the .json file

Expected Feature

The user should be able to specify other command-line options alongside with --config/-c, if those options are not already specified inside the config JSON file

Example

Given the following config.json file:

{
  "output": "/test/"
}

If the user only uses --config/-c, i.e.:

python main.py --config config.json

The program will produce an error since there are no input files/folders.

The user should be able to use other options alongside the --config/-c flag, so that they can specify any options missing from the config JSON file, i.e.:

python main.py --config config.json -i test.txt --lang en-UK

If both exists, the configs inside the config JSON file will take precedence over the command-line options