[Github-comments] [geany/geany] Plugin-API: extended project API (#2234)

[LarsGit223]

**Update:**
I added the missing doc comments for the return values. I also added a setter and getter function for ```project_prefs.project_session```.

**For what do I need it?**
As written at the top I want to add a functionality in the Workbench plugin to switch between projects. I plan to implement two ways of switching:
1. using the popup menu of the Workbench sidebar
1. on activating of a document that means select/open the project to which the document belongs

Option 1 works fine and does not need the access to ```project_prefs.project_session```. The problem with option 2 was that Geany crashed if I close and open a new project in the callback function for ```document-activate```. Calling it on idle worked but lead to all documents being closed including the just opened one if ```project_prefs.project_session``` is set. So I needed a setter and getter function to shortly disable the option and restore the old value after the new project is opened.


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