Promise which is resolved when the system is initialized and ready to use.
Is this object destroyed?
Checks if the system is initialized and ready to use.
Binds new registration with itself. This registration/destroyable will be destroyed with this.
Checks if the system is initialized and ready to use. If not, throws an error. If it is, do nothing.
Checks, whether the object is not destroyed
Message that will replace default one before error
Callback runed before error is thrown; typically this can be some logging
Chcek whether the given object is destroyable
GenerateSystem is a kind of import system which allows us to import/create whole boards from other sources. Note: CreateSystem - for individual arts, GenerateSystem - for whole board Note: CreateSystem+GenerateSystem and ExportSystem are in some kind opposites.