[aadl]: New stable release: OSATE 2.4.0

[Lutz Wrage]

A new stable release of OSATE, version 2.4.0, is now available for download
at http://osate-build.sei.cmu.edu/download/osate/stable/2.4.0/products/. 
The archive files contain the complete version of OSATE.

For installation into an existing Eclipse Oxygen.3a installation, an update 
site is available at http://osate-build.sei.cmu.edu/download/osate/stable/2.4.0/updates/.


Please note:

- We have removed execution of Java and Python verification methods that are 
  located in a project in the workspace. Do not upgrade if you need this functionality.
- OSATE is now based on Eclipse 2018-12
- Resolute and AGREE are no longer integrated. The versions included in OSATE 2.3.7 
  can be installed into OSATE 2.4.0 from http://osate-build.sei.cmu.edu/download/osate/stable/2.3.7/updates. 
  Once newer versions are provided by Loonwerks we will make them available via 
  the "Install Additional OSATE Features" dialog.

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Release notes are available at http://osate.org/osate-releases.html#version-2-4-0

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As always, please report bugs using the main github issue tracker: https://github.com/osate/osate2/issues

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See our web site at http://osate.org for OSATE related information including download and installation instructions.