Ensure inheritance and dependencies invalidation is properly supported

[Marek Bartoš]

• annotations/attributes should define source class, if it is a parent and not the current class (prerequirement of #35)
• each mapped object metadata should define list of dependencies to check for metadata invalidation (any classes used in rules, used traits, implemented interfaces and extended classes) - continues in #47
• referenced constants from other classes should ideally result in checking their class, but that may be not possible) - same as previous, #47
• cache in variable for performance in development mode (in production metadata are cached permanently) (already works partially, continues in #48)
• each (mapped object) class and trait in hierarchy should allow mapped properties
• each (mapped object) class and trait in hierarchy should allow callbacks - continues in #52
• each (mapped object) class in hierarchy should allow docs annotations (traits probably not, some doc annotations are unique, some are not) - same as previous, #52

[Marek Bartoš]

• Rules, callbacks, docs and modifiers should also check scope in which are defined - while attributes and annotations validate if they are above class/property, custom sources should not be expected to do so - continues in #53
• Traits may define Skipped and FieldName modifiers, modifier CreateWithoutConstructor should be exclusive to real class - BS
• CreateWithoutConstructor should be allowed only by first inheritor of MappedObject, child of a mapped object implementation should not be allowed to change something, what parent class does not support - continues in #54, bit modified
• Interfaces should not define anyting - it is fine, interfaces can define e.g. callbacks and docs

[Marek Bartoš]

New issues opened for individual tasks (links added to relevant tasks)

[github-actions]

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