Rafcon

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- Features:
- Not supporting Python 2 anymore
- Run this state
- Only run this state
- Add singleton pattern
- Add new hooks before and after running each state
- Add new memory profiling test to assert the memory leak during running sequential & concurrency state machines
- Update gaphas to 2.1.2
- Update libsass to the latest version of dart sass
- Replace gtkmvc3 with two separated mvc and observer patterns
- Run this state

- Bug Fixes:
- Fix GUI freezing during keeping undo/redo shortcuts

- Miscellaneous:
- Remove last update field to improve versioning control
- Remove a big amount of the dead codes and comments

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- Bug Fixes:
- Support custom design

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- Bug Fixes:
- Fix bug in LoggingView, which freezes RAFCON

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- Bug Fixes:
- Make operations on the logging console thread-safe
- Define a new GUI config called 'MAX_LOGGING_BUFFER_LINES' that determines the maximum lines of the logging buffer. If the number of lines exceeds the config value, the old value will be deleted automatically via clipping.

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- Bug Fixes:
- Call 'show_notification' via 'idle_add'

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- Features:
- Libraries can now be renamed and relocated. This includes single libraries, library folders and library root keys
- Ctrl+F can be used to search for states
- Missing libraries are supported better. In case a library cannot be found, the transitions and data-flows are preserved and added to the dummy-state, which is inserted instead of the library. Furthermore, the dummy-state has the same position and size as the old library state.
- New execution-history structure: Define specific consumers for in-memory-execution-history and file-system execution history. Furthermore, another hook was defined such that RAFCON plugins can be used to define further consumers. Watch out: the config values for controlling the execution history changed