Pluggable architecture (RM #797)

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Issue migrated from Redmine: https://redmine.postgresql.org/issues/797
Originally created by Dave Page at 2014-08-26 17:27:05 UTC.

Whilst not a feature in itself, I'm recording this as one so it doesn't get lost. pgAdmin 4 should be based around a pluggable architecture to allow easy enhancement and extension.

• Modules should be able to register menu options and even top-level menus upon initialisation, and provide the appropriate methods to execute the function and enable/disable menu options.
• Modules should be able to register additional treeview node classes to be attached to existing node classes when the treeview is rendered.

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Comment migrated from Redmine: https://redmine.postgresql.org/issues/797#note-1
Originally created by Dave Page at 2015-01-26 15:28:25 UTC.

Support for dynamically loaded Blueprints added in commit:7b8cb207

Redmine ticket header update:

Name	Old Value	New Value
Status changed	New	In Progress
Assigned To changed		Dave Page
Fixed Version changed		1.0 Beta 1
Done Ratio changed	0	50

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Comment migrated from Redmine: https://redmine.postgresql.org/issues/797#note-2
Originally created by Dave Page at 2015-02-26 10:28:44 UTC.

Pluggable treeview node support added in commit:89cc11fb

Redmine ticket header update:

Name	Old Value	New Value
Status changed	In Progress	Resolved
Done Ratio changed	50	100

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Issue closed on Redmine.