LP#1750894 Workstation & Cascade settings

LP#1750894 Workstation & Cascade settings

Adds a new config.workstation_setting_type table for managing
workstation-specific settings.

Adds new PG and perl API functionality for determining values for
settings which may be represnted as workstation, user, and/or org unit
settings.

Teaches the AngularJS browser client to load and apply most settings at
the server.  Values for settings stored in localStorage/Hatch are migrated
to server settings at time of next use.

Stock workstation setting types added to accommodate most browser client
settings.

Signed-off-by: Bill Erickson <berickxx@gmail.com>