Rafcon

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- Improvements:

- add tox integration

- run tests under Python interpreters 2.7, 3.4, 3.5, 3.6, 3.7
- run tests with coverage
- build documentation and check links
- check sdist

- optimize setup_requires in setup.py (faster installation)
- mark unreliable tests as unstable
- define timeouts for all tests

- Bug Fixes:

- :issue_ghe:`689` rafcon cannot run without numpy
- :issue_ghe:`679` error message when connecting data flow
- fix severe threading bug in call_gui_callback, which could lead to a complete freeze of a state machine

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- Features:

- add ExecutionTicker to see activity of state machine with high hierarchy depth

- Improvements:

- changing states (adding or removing) during step mode works now

- Bug Fixes:

- :issue_ghe:`678` script validation does not work
- :issue_ghe:`663` cannot rename connected data port of type object
- :issue_ghe:`684` ``test_simple_execution_model_and_core_destruct_with_gui`` fails when running core & gui tests in a row
- fix pause and step mode behavior
- installation of fonts under Python 3
- various test fixed for Python 3

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- Bug Fixes:

- Continue installation of none-existing fonts in case that one font was already installed

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- Bug Fixes:

- Fix installation of not-existing fonts
- :issue_ghe:`660` tab of executed state machine stays green
- :issue_ghe:`667` dialog "saving state as library" not working properly
- :issue_ghe:`664` cleaning of execution history does not work
- :issue_ghe:`668` adding a state as template screws up meta data
- Fix rescaling factor**2 if adding libraries as template
- :issue_ghe:`631` Cut of multiple states creates various problems

- Changes:

- Increase any MAX_VISIBLE_LIBRARY_HIERARCHY value to be minimal 2 -> for performance the aim is to allow lower values again

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- Changes:

- Release correct style files

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- Features:

- The right click menu of library state can be used to select and focus respective library tree element

- Bug Fixes:

- :issue_ghe:`658` crash in load_state_machine
- run correct command for updating font cache

- Changes:

- Replaced font "DIN Next LT Pro" by "Source Sans Pro"