Add "Open Containing Folder" action
This commit adds an action to the File menu which will open the default file manager and highlight the current file there.
Many KDE applications (Kate, kdenlive, KFind, Okular, …) have such an action already because it is very handy in various workflows. It makes sense to add it based on consistency alone, however I also personally miss it every time I use Kile because I tend to manually backup the file I just edited when I am done, but for this I need to find the file in the Dolphin file manager first. This procedure is greatly simplified by adding this action.
Hi, nice to meet you. This is my first Kile MR.