Strict usage of Context

[SebastianKuesters]

The usage to dependencies like the ISpaceBlocksContext should be limited to the Authorization pre-processor. All information which is needed for pre-, post- and main-handling of a command should be part of the command.

• Log warning if a dependency which is registered for storing along delayed commands is used as parameter of pre-; post- oder handler
• Document this decision

The goal of this is to avoid chaos. Moreover a developer directly sees all information which is required to execute the command without checking the processors and handler implementation.