Support loading add-on configurations - #930
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Enables users to load additional mw::com configurations. Introduced a new public API to load these configurations. It is expected that a complete configuration has been loaded before. Configuration validation got a new boolean parameter, because for add-on configurations, which only contain service definitions the default validation can not be performed.
In order to avoid use of mutexes for configuration elements read access, the internal data structures for those have been changed to use a list of maps, so that atomic loads and storage can be used wherever possible (i.e. mutexes only protecting write access). This change is necessary because with the loading of add-on configurations, an already initialized configuration might be extended.
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Enables users to load add-on mw::com configurations after loading the actual application's configuration.
Only service definitions of these add-on configurations will be considered and merged into the existing configuration if there is no conflict with the already existing configuration.
Restructured the Configuration's internal data structures for service types and service instances so that the use of mutex/locks to protect the configuration can be limited to a minimum.