Streamline API calls from UI (incl. Fix #1311, #1314)

[Lord-Grey]

Summary

• Refactor/Optimization: Load configuration of last instance used when loading the UI page
• Refactor: Streamline API requests to avoid unnecessary invocations
• JSONEditor: Disable watchers while updating dynamic selection boxes, to avoid unnecessary update triggers
• Network LED-Device UI: Trigger getProperties for the configured host, when no hosts were discovered
• Fixes: LED layout - Additional parameters for classic layout were not saved (UI bug : Pannel Led Output/Led Layout parameter Load/Edit/Save #1314)

UI page initialisation sequence

content_index.js - document.ready
initWebSocket()
-> websocket.onopen
	trigger open
-> open
	requestRequiresAdminAuth()
	->cmd-authorize-newPasswordRequired
		requestAuthorization()/requestTokenAuthorization()
	-> cmd-authorize-login
		requestSysInfo()
		-> cmd-sysinfo
		requestServerInfo()
		-> cmd-serverinfo
		requestServerConfigSchema()
		-> cmd-config-getschema
			instanceSwitch()
				requestInstanceSwitch()
				(updateHyperionInstanceListing)
				-> cmd-instance-switchTo
					requestServerConfig()
					-> cmd-config-getconfig
					requestServerInfo()
					-> cmd-serverinfo

content_index - ready
	loadContent()

document.ready

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Docs
• Build-related changes
• Other, please describe:

If changing the UI of web configuration, please provide the before/after screenshot:

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing setups:

The PR fulfills these requirements:

• When resolving a specific issue, it's referenced in the PR's body (e.g. Fixes: #xxx[,#xxx], where "xxx" is the issue number)

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature
• Related documents have been updated (docs/docs/en)
• Related tests have been updated

PLEASE DON'T FORGET TO ADD YOUR CHANGES TO CHANGELOG.MD

• Yes, CHANGELOG.md is also updated

To avoid wasting your time, it's best to open a feature request issue first and wait for approval before working on it.

Other information:

Fixes #1311, #1314

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