Add option to always open query window in maximized mode

[peetw]

Currently, new query windows are opened in non-maximized mode and do not remember the last opened mode setting (i.e. if the window is maximized after launch and then closed, subsequent new windows are still not opened maximized).

It would be great if there was an option to force new query windows to always be opened maximized. Alternatively, if the application could remember the last opened state, that would be great too.