User Story : query history

[tfrancart]

@antoine37120 has developped an impressive prototype for persisting Sparnatural queries, it looks like this:

This opens the possibility of:

1. Persisting the queries in a database on a server
2. Persisting the queries in a browser-side query history, specific to the user

Solution 2 is much simpler to implement to start with. This would allow a user to keep locally nice queries and reload them easily.

The story is the following:

1. Each time I click the submit button, the query is persisted in query history in my browser
2. I can access my local query history (see screenshot from Antoine)
3. I can reload a query directly from my history
4. I can star/mark my preferred queries to retrieve them easily. I can give them a name and a description
5. I can delete queries from my history, or purge my query history