update layer list on get_capabilities

Currently a click on the button "get capabilities" in the UI calls wms.get_capabilities. This delivers always the same information which was once created on server process start and first request. It returns the same amount of data independent of file changes on the server by repeating a lot of methods.

We have to take care that deleting or adding server files will be handled here. A click on the UIs "get capabilities" should always show the current state of files on the server, without reinitiation the server itselfs.

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