AbstractCommunicationManager methods not depending on internal state should be moved

[vaadin-bot]

Originally by @jdahlstrom

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AbstractCommunicationManager contains utility methods that do not depend on ACM state. These should be moved to an Util class if they don't seem to fit anywhere else.

• encodeState

• getStreamVariableTargetUrl
• getConnector (depends on DnD service; see Move DragAndDropService to VaadinSession #3704)
• handleConnectorRelatedException
• isConnectorVisibleToClient
• isComponentVisibleToClient
• getDirtyVisibleConnectors (should be removed)

[stale]

Hello there!

It looks like this issue hasn't progressed lately. There are so many issues that we just can't deal them all within a reasonable timeframe.

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