Backporting TransportPlotting plugin to citadel

[francocipollone]

Context

The plotting feature was implemented for ign-gui4 (dome) and then forward-ported to newer releases, however, it was never backported to ign-gui3(citadel) which is a LTS.

Implementation

I tried backporting it to ign-gui3. Here is the commit/branch: 1a4d323

And it seems to be working correctly:

Note: I had started following the instructions as it is explained in the contributions section about what is the correct way to backport a feature, which is using cherry-pick and fixing the conflicts. However, this feature was added in several commits and given it was added a year ago, some changes/bug-fixes affected those files afterward so that method wasn't that smooth.

If you give me the thumbs up and there is nothing that prevents us from backporting it I will go ahead and create PR based on the branch I shared.

Related to #66

[chapulina]

Thanks for looking into it! The problematic bit is this change:

-    class IGNITION_GUI_VISIBLE Application : public QGuiApplication
+    class IGNITION_GUI_VISIBLE Application : public QApplication

This breaks ABI and can't be done in a stable distribution.

[francocipollone]

Thanks for looking into it! The problematic bit is this change:

-    class IGNITION_GUI_VISIBLE Application : public QGuiApplication
+    class IGNITION_GUI_VISIBLE Application : public QApplication

This breaks ABI and can't be done in a stable distribution.

Thanks for the quick reply!
Oh you are right it can't be ported! Ok then, in our project we'll probably need to migrate to a newer release then.
(Fortress is candidate given that it is LTS, good timing :D).

Thanks again. Feel free to close the issue.