Refactored Metadata class
Refactored IndexEntry to Dataset and merged with original Dataset class
Refactored Index class
Added import feature to project to import data from csv/tsv files
Added import and export commands
Removed separator function
Changed some pipeline parameters with index file values
Using project configuration to prepare pipeline
Avoiding file duplication in dataset entry and added tool listener to add tool output file(s) to the index
Project class - getting datasets from the index and added function to import metadata into the project
GR-36 - added import command to import datasets information from csv/tsv files
Updated Metadata constructor to set string values
Updated index tests to the new implementation
Updated help message for import command
Removed old code from project test - doing nothing for now