ACA2017 0.8.8 released

Changes for 0.8.8

I added some error handling for missing folders and some adjustments for the use of add-on.xml files.

You now get a warning which folders are listed in your cfg or xml files but are not found on your system when starting ACA2017.
If you do not want these warnings you can put them off in the Options -> Options, just check the ‘do not warn me on missing folders’ option