Support Running multiple queries in separated tabs

[eMerzh]

for the the query tabs are a little fucked up,
if you try to open two tabs, and run "long enough" query that you can switch tab, you exposes yourself to messed up data..
like data coming from other tabs, or infinite loading data results, ....

[maxcnunes]

I added support for this on https://github.com/sqlectron/sqlectron-core/releases/tag/v7.1.0.
But still have to change the GUI to work properly. I'm a bit tired to implement it right now. So if anyone is interested in helping with that let me know and I can give some ideas of how to do it.