Switch support from cppTango 9.3 to 9.4
This MR makes PyTango compatible with cppTango 9.4 instead of cppTango 9.3.
Since there were several git issues with original develop_9.4 branch, we decided to make "clear" branch, which contains only useful commits:
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MR !469 (merged), MR !459 (merged), MR !431 (closed)
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changes in binding, caused by cppTango!886 (merged), cppTango!973 (merged)
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making our CI compatible with rc and dev versions of cppTango, including compiling TangoTest instead of installing it (fixes #424 (closed), supersedes !432 (closed))
Also closes #473 (closed) (which was merged into this branch via !488 (merged))
Edited by Anton Joubert