MIRABase-1.22.0:
- HumanReadableEnum:
  - the enum class and the associated toString() are declared in sub-namespace
    human_readable_enum, to avoid shadowing mira::toString()
  - added stream output operator for the enum class
- XMLDomPreprocessor:
  - <if_[not_]exists> will throw an error if the file or package attribute depends
    on a variable that is not set (instead of resolving to "file/package does not exist")
- unified package cache used by framework and bash tools

MIRAFramework-1.20.0:
- slot cloning for ChannelRead:
  - changed implementation, fixing accidentally removed support for non-copyable Channel types
  - fixed overflow from unprotected access to serializedValue buffer
- fixed use-after-free bug in channel synchronizer
- Channel::write(true) (automatically copying latest channel data to new write slot)
  can take a specific copy function as a second parameter