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Also add the alternative way: IOptionsPageProvider, which states
a category, and is asked for a list of options pages for that
category when it is shown.

Task-number: QTCREATORBUG-3131

This is now also postponed to the first switch to debug mode.

Acked-By: hjk

Looks like DebuggerPlugin::mainWindow() was used after all.

Task-number: QTCREATORBUG-3292

Extend type checking for container templates. Add utility
function to obtain container size.

Put it in new top-level "Maemo" category, along
with the Maemo device configurations.

Reviewed-by: kh1

Add a tooltip for disabled toolchains in the selector dialog.

Delay the setup of the UI until the Debug mode is activated. This is
required by the Debugger now setting up most of it's UI in
extensionsInitialized ...