Allows disabling the editbar using a host setting

[meetmandeep]

Closes #4038

To Disable Edit Bar

insert into HostSettings values ('DisableEditBar', 'True',0,-1,GETDATE(),-1,GETDATE())

Or (if setting already exists)

update HostSettings
set SettingValue = 'True'
where SettingName = 'DisableEditBar'

To Enable Edit Bar

update HostSettings
set SettingValue = 'False'
where SettingName = 'DisableEditBar'

Or

delete from HostSettings where SettingName = 'DisableEditBar'

Disabled View

If edit bar is disabled, the tooltip reads "Edit Bar is disabled." and help text reads "This DNN installation is running an alternative edit bar."

I couldn't find a way to swap the icon image with another way. Let me know if anyone has any pointers.

[mikesmeltzer]

Added some feedback to issue #4038.

[david-poindexter]

Looks okay to me - thanks @meetmandeep

[bdukes]

LGTM, thanks!