Add windows command line support (to allow opening .sql file directly into Query Tool) (RM #3064)

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Issue migrated from Redmine: https://redmine.postgresql.org/issues/3064
Originally created by Ryan Uhlman at 2018-01-28 09:38:07 UTC.

In pgAdminIII there was windows command line support which would allow to connect directly to a database and pass in a file. This allowed me to associate the file with pgAdminIII in windows. Upon doing that I was able to double click a .sql file and it would open pgAdminIII, connect to a database that was predetermined by me, and pass in the sql statement directly into the Query tool.

The command below allowed double clicking the file to (open pgAdminIII,connect, auto populate sql statement from file into Query Tool)
"C:\Users\Ryan\pgsql\bin\pgAdmin3.exe" -qc "host=localhost dbname=data port=5432 user=Ryan" -f "%1"

The command below allowed double clicking the file to (open pgAdminIII, [alert box to input server, database, etc], auto populate sql statment from file into Query Tool)
"C:\Users\ruhlman\pgsql\bin\pgAdmin3.exe" -q -f "%1"

Thank you for your support.

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Comment migrated from Redmine: https://redmine.postgresql.org/issues/3064#note-1
Originally created by Fahar Abbas at 2018-02-16 11:12:54 UTC.

pgAdmin4 3.0 and onwards versions will completely web based. So not sure if we can implement tis feature. Dave any thougths?

Redmine ticket header update:

Name	Old Value	New Value
Assigned To changed		Dave Page

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Comment migrated from Redmine: https://redmine.postgresql.org/issues/3064#note-2
Originally created by Akshay Joshi at 2018-05-18 10:44:08 UTC.

Need some more R&D and design.

Redmine ticket header update:

Name	Old Value	New Value
Sprint changed		Ready

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Comment migrated from Redmine: https://redmine.postgresql.org/issues/3064#note-3
Originally created by Akshay Joshi at 2018-05-18 10:44:29 UTC.

Redmine ticket header update:

Name	Old Value	New Value
Assigned To changed	Dave Page