Analyzer: Use action as handle for tool plus start mode

Change-Id: I33f99f28fb99c21cc62cda57ec1ba1aa2963b065
Reviewed-by: Aurindam Jana <aurindam.jana@digia.com>
Reviewed-by: Christiaan Janssen <christiaan.janssen@digia.com>
Analyzer: Inline Setting::registerTool into its only user

Change-Id: I10f57785bd26a15aef6fe72f26e7bf28a3a8d31f
Reviewed-by: Aurindam Jana <aurindam.jana@digia.com>
Analyzer: Flatten AnalyzerManager::addTool

Add tool/startMode combo one by one.

Change-Id: I1e6cfe98fb1b1291cae6f440105991f3f99f2a6a
Reviewed-by: Aurindam Jana <aurindam.jana@digia.com>