Improve Save/Import selections Implementation

[oxedom]

Issue: Improve save and import function for Parkerr

Problem

Currently, the save function in Parkerr only saves the state of the selectedRois to local storage, and the import function only imports from local storage. However, there is no UI for this, and the program is using alerts to communicate with user. This is inconvenient for daily use, as well as there is no option to make multiple saves.

Solution

We need to improve the save and import function so that users can save JSON/CSV files as well as import them.
As well as improve the UI for this functionality

Tasks

DONE Improve and research data structure for selectedRoiState
DONE Improve the UI for the save and import functions
DONE Remove the alerts

Add Support for CSV
Clean Data function before exporting