Add the -f option and change way to create output

[soimkim]

Description

• Add the -f option to input the output file format.
• Change it to use FL Util's functions when generating output.
• Input Mode
  • AS-IS: If user just type enter, it asks user to re-enter (try 2 times).
    Source and dependency path to be analyzed are inputted respectively.
  • TO-BE: If user just type enter in the input mode, it is assumed that nothing has been inputted.
    Source and dependency path to be analyzed is input at once.

Type of change

Please insert 'x' one of the type of change.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Documentation update
• Refactoring, Maintenance
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

[soimkim]

The error is because the FL dependency hasn't been released yet.