Synchronized Type Dictionary

[ondrej-bouda]

• Currently, the type dictionary is cached for the whole script lifetime, or even among individual requests. As such, any changes to type registers or in the connected-to database are not reflected by the Type Dictionary.
• The only way to handle such changes after the Type Dictionary is set up is to manually call the `ITypeControl::flushTypeDictionary()`` method.
• Implement updating the type dictionary according to the changes in type registers.
• Update the docs for TypeRegister then - currently, it says: "later registration changes of types, types loaders or type supplements are not reflected".