Container creates instances of classes that contain virtual abstract methods without further notice

[Stefan Glienke]

Usually when creating instances of classes that have virtual abstract methods the compiler generates a warning. However when the container does so it happens without further notice.

This should be improved by either preventing to create the instance (exception) or by at least logging it as warning.

[Stefan Glienke]

This could be solved by a special builder inspector that checks the componenttype for abstract methods.

[Stefan Glienke]

added inspector that logs warning when component contains abstract method (fixes #193)

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