[pgAdmin][RM4139] Drag and drop object names in Query Editor from Browser Tree

Hi Hackers,

Attached is the patch to allow tree nodes to be dragged and dropped in
query editor wherever you take the drop cursor. The drop text will be fully
qualified and double quoted if required.
For functions/procedures it will drop the the label stripping away the
parameter names, with empty pair of round brackets. It will also set the
focus cursor inside the brackets if there were params otherwiser to the end
of text.
For adding a node type, you need to register it in browser.js along with a
callback function which will return drop text along with cursor positioning
and selection. Currently, I have registered for "table partition type
sequence package view mview foreign_table edbvar schema column edbfunc
function edbproc procedure".

Please note, the drag design customisation is not supported in IE.

Kindly review.

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Thanks and Regards,
Aditya Toshniwal
Software Engineer | EnterpriseDB India | Pune
"Don't Complain about Heat, Plant a TREE"