Split the code in multiple modules

[pawamoy]

1. shellhistory.sh: provide the command-line tool with commands to enable and disable the extended shell history.
2. the database: database-related Python code
3. the web app: flask app to visualize the data, making use the database-related code
4. plugins: add subcommands to the CLI tool:
   • import data from file
   • export data to file
   • search database
   • CRUD rows in the database

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