Minor cleanup

Dilemma:
 - IPageLayout.ID_RES_NAV is deprecated, but we do not want to migrate to Common Navigator Framework
 - @SuppressWarnings("deprecation") not allowed by coding guidelines
 

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- Add loadModelFromFileWithUnknownFeatures(URI uri, boolean logError) that enables to not log errors to the console
- loadModelFromFileWithUnknownFeatures(URI uri) kept for compatibility

  - It can be used to specify that for a particular model element no editor is available.
  - This avoids that ModelEditorBindingService further walks up the model hierarchy to look for an editor that is registered for one of the ancestors. Currently, this had the the effect that for a model element without explicit editor, the project configuration editor (that is registered for the root element "FileProject") has been opened

Use the the new ModelEditorNotAvailableBinding mechanism for the following model elements
  - SystemSchedule
  - AllocationTableCollection
  - SafetyArgumentationPackage
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Add isDirectlyDerived(), a predicate whether a given {@code type} is directly derived from a given {@code superType}, or whether the {@code type} implements the {@code superType} interface.
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- Enable automatic layouter only for diagrams without rounded edges, which is the case if none of the positions of the connected connectors is specified using an angle (i.e., in particular also if the model does not contain any connectors, or none of the connectors is connected to a connection).
- getContributedItems(): Use shortcut style when checking conditions, i.e. return dedicated value at as soon as possible, instead of using nested ifs
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- Add parser interface for exploration expression language (visitor). This includes an additional EOperation for IExpressions to accept visitors.
- Implement a base class for expression evaluators.
- Add a Deployment validator that performs an evaluation against a given ExplorationSpecification and which uses expression evaluator base class.
- Add a context menu entry to launch the Deployment validation.
- Add two Utility methods to handle integer and floating point numbers.
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- Enable specialized handling for feedback edges (results into slightly larger, but more meaningful diagrams)
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