Would it be possible to introduce an enhaced variable editing dialog for runtime/build variables when you open the project configuration?

Currently all variables are listed in a table with showing the variable in the first column and the value in the second column. When you look at Path (Windows) or LD_LIBRARY_PATH (Linux) then the value is a concatenation of multiple pathes with a ; or : as a separator.

The idea is to open a new dialog similar to the windows 10 system variables variable editing dialog. So when you edit the LD_LIBRARY_PATH then a dialog opens that has all values shown in multiple lines, taking into account the system specific variable separators ( ':' or ';' ).

I think i could implement this with some little guidance and create a PR.

A screenshot of the current dialog is shown below. Also a screenshot of how this could look (and is available for system variables in the latest Windows 10).